communicating through the ages - R. A. Mayes Company

COMMUNICATING THROUGH THE AGESIf you are as “ancient” as I am, you will remember when theonly two-way communication was by land-line telephone ortelegraph, radio telegraph between ships, and a few specializedcontacts between people. Two-way voice communication beganbetween “hams” and between commercial offices.In the early 1920’s radio broadcast stations began to operate.People (like me) built crystal radio receivers using coils woundon oatmeal boxes and using “cat’s whisker” galena detectorsdriving high impedance headphones. I remember connectingthree or four headphones in series on one crystal set so thatseveral people could listen at the same time.But nothing is static. All things change. Higher and higherfrequencies were used when vacuum tubes replaced the galenadetectors and amplifiers were added to drive cumbersome loudspeakers.In time, television was developed from a spinning diskinto a system using a cathode ray tube to display the images.FM broadcast stations began, touted as noise-free music stations.From these meager, and sometimes painful, beginnings youare now able to communicate with people all over the worldvia telephone and FAX, and by electronic mail on your homecomputer. Using the Internet or a WEB site you can exploreinnumerable sources of important and vital informationanywhere, any time, for the cost of a local telephone call.Technology has proceeded at an exponential rate and the endis not in sight.Some of the items available in this catalog would not have beenpossible a decade ago. Some call us foolish, but we continueto keep abreast of the changes in test requirements forEMI specifications. For example, we have developed tunablemodules (Type 9554 series) which, when used with ourModel 9354-1 Universal Transient Generator, enable testengineers (like you) to apply damped sine wave pulses to a testsample over the full range of 10 KHz to 100 MHz at the levelsstipulated in MIL-STD-461C/D/E and other specifications. Theinjection technique requires an Injection Probe, such as ourType 9335-2,to couple the pulse onto the line.Our day-by-day development of new EMI test equipment andrelated products since 1960 is substantial proof that, “Thereis no substitute for experience”. We would like to hear fromyou because we know we can help with your EMI problems.Communicate with us via telephone, FAX or E-mail.Cordially,Al Parker1

TABLE OF CONTENTSPageCHART — ESSENTIAL APPARATUS FOR PERFORMING TESTS IN ACCORDANCE WITHMIL-STD-461D/E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7MIL-STD-461A/B/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Model No.6254-5S6550-16552-1A7054-17054-1A7054-1B7399-27824-18282-18850-19354-19355-19554-( )Type No.6541-17512-17541-18022-18614-19335-29533-1INSTRUMENTSRFI TRANSIENT GENERATOR, 250 volts, 10 microseconds decay time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25POWER SWEEP GENERATOR, 100 watts output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31AUDIO POWER AMPLIFIER, 100 watts output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29SPIKE GENERATOR, 600 volts, 10 microseconds decay time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23SPIKE GENERATOR, 400 volts, 50 microseconds decay time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23SPIKE GENERATOR, 400 volts, 120 microseconds decay time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23SPIKE GENERATOR, 2500 volts, 90 microseconds decay time, meets Appendix A, B, C of MIL-STD-1399 . . . . . . . . . . . . . . .21AUDIO POWER AMPLIFIER (Rack version of 6552-1A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29TRANSIENT PULSE GENERATOR for MIL-STD-461B/C, three waveshapes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19HIGH POWER SWEEP GENERATOR, 200 watts output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27UNIVERSAL TRANSIENT GENERATOR, damped sinewave/double exponential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9PULSE GENERATOR for MIL-STD-461D, Method CS115 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17VARIABLE FREQUENCY MODULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13PROBESINDUCTION PROBE, 1.25" I.D. for LEM spec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*SPIKE INJECTION PROBE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77SPIKE INJECTION PROBE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77CURRENT PROBE FOR CS09 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*F.C.C. "LINE PROBE" (CAPACITY COUPLER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41IMPEDANCE MATCHING INJECTION PROBE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15VOLTAGE PROBE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41* Call for details.3

TABLE OF CONTENTS (cont.)RFI/EMI CURRENT PROBES AND INJECTION PROBESPageFOR MEASUREMENT AND/OR INJECTION OF R.F. CURRENT ON WIRES OR CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33Model No.7334-17429-19130-19229-19230-1ANTENNASLOOP ANTENNA, RE01, RE04, RE101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47LOOP ANTENNA, RS01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49LOOP ANTENNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55LOOP SENSOR, RS101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45LOOP ANTENNA, RS101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45LINE IMPEDANCE STABILIZATION NETWORKSFOR MEASUREMENT OF EMI VOLTAGE FROM POWER LINES TO GROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37F.C.C. LINE IMPEDANCE STABILIZATION NETWORKSNETWORKS FOR COMPLIANCE WITH F.C.C. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41LINE IMPEDANCE SIMULATION NETWORKSNETWORKS TO SIMULATE IMPEDANCE OF SPACECRAFT D.C. POWER SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43WAVE FILTERSLOW PASS, HIGH PASS, BANDPASS, BAND REJECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .656512-106R7012-106R7113-106R7314-106R7525-19133-19146-16220-1A6220-26220-47032-17032-2CAPACITORSFEED-THRU CAPACITOR, 10 F, 250 volts @ 400 Hz, 100 amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63FEED-THRU CAPACITOR, 10 F, 500 volts @ 400 Hz, 200 amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64FEED-THRU CAPACITOR, 10 F, 500 volts @ 400 Hz, 500 amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64FEED-THRU CAPACITOR, 10 F, 300 volts @ 400 Hz, 100 amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64SERIES CAPACITOR, 0.1 F, BNC connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69THREE PHASE DELTA CAPACITOR, 10 F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68THREE PHASE WYE CAPACITOR, 10 F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*TRANSFORMERSAUDIO ISOLATION TRANSFORMER, 50 amperes line current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57AUDIO ISOLATION TRANSFORMER, 100 amperes line current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57HIGH VOLTAGE COUPLING TRANSFORMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57ISOLATION TRANSFORMER, 115/115 V, 50 to 400 Hz, 800 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29, 31ISOLATION TRANSFORMER, 230/230 V, 50 to 400 Hz, 800 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32* Call for details.4

TABLE OF CONTENTS (cont.)Type No.7032-37033-17035-18810-18811-19138-16254-1507115-17115-27332-17406-17802-18282-1508527-18527-28908-19007-17415-37835-8917835-8927835-8968614-19132-19407-16920-0.57144-1.07144-5.07144-10.08415-18525-1TRANSFORMERS (cont.)ISOLATION TRANSFORMER, 124/240 V, 50 to 400 Hz, 800 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67IMPEDANCE MATCHING TRANSFORMER, 2.4 ohms to 50 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31WIDE RANGE TRANSFORMER, 115 V output @ 80 watts (for 6550-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31IMPEDANCE MATCHING TRANSFORMER, 1.5 phms to 50 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27WIDE RANGE TRANSFORMER, 115 V output @ 200 watts (for 8850-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27STEP UP 2KV, 3 KHz to 30 KHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27PULSE TRANSFORMERSPULSE TRANSFORMER, 150 ampere secondary (Use with 6254-5S or 7054-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26PULSE TRANSFORMER, 15 KV (Use with 6254-5S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71PULSE TRANSFORMER, 15 KV (Use with 8282-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71PULSE TRANSFORMER (Use with 7054-1A, step up to 600 V into 6 ohms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24PULSE TRANSFORMER (Use with 7054-1A, step up to 1200 V into 50 ohms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24PULSE TRANSFORMER (Use with 6254-5S, step up to 450 V into 12 ohms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26PULSE TRANSFORMER, 150 ampere secondary (Use with 8282-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20PULSE TRANSFORMER (Use with 7054-1, step up to 2 KV into 50 ohms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24PULSE TRANSFORMER (Use with 8282-1, step up to 2 KV into 50 ohms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20PULSE TRANSFORMER, plugs into 8282-1 to provide 600 V from 50 ohm source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20PULSE TRANSFORMER, plugs into 8282-1 to provide 1200 volts from 50 ohm source, 0.15 S . . . . . . . . . . . . . . . . . . . . . . .20COUPLING NETWORKSR.F. COUPLING AND HIGH PASS FILTER, 50 KHz to 400 MHz, 270 V.A.C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69COUPLING NETWORK, equivalent to CU-891/URM-85, 50 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67COUPLING NETWORK, equivalent to CU-892/URM-85, 500 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67COUPLING NETWORK, equivalent to CU-896/URM-85, 50 ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67COUPLING NETWORK, "LINE PROBE" FOR F.C.C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41R.F. COUPLER AND HIGH PASS FILTER, 500 V.A.C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69THREE PHASE R.F. COUPLING NETWORK, 2 MHz to 30 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69RESISTIVE DEVICESRESISTIVE NETWORK, 0.5 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67PRECISION RESISTOR, 1.0 ohm, 50 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67PRECISION RESISTOR, 5.0 ohms, 50 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*PRECISION RESISTOR, 10.0 ohms, 50 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67PRECISION SHUNT RESISTOR, .001 ohm, 0.25%, 100 amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29NON-INDUCTIVE LOAD RESISTOR, 5.0 ohms, 5%, 2 watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24* Call for details.Page5

TABLE OF CONTENTS (cont.)Type No.8814-1.58814-2.49224-1.09225-0.59226-0.57510-17519-18121-18128-18806-18801-1.6— —— —PageRESISTIVE DEVICES, cont.RESISTIVE LOAD, 300 watt 1.5 ohm load for normalizing the impedance of the 6220-1A Transformer . . . . . . . . . . . . . . . .68RESISTIVE LOAD, 200 watt 2.4 ohm load for normalizing the impedance of the 6220-1A Transformer . . . . . . . . . . . . . . . .68PRECISION RESISTOR, 1.0 ohm, 1%, for use in CE101 tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*PRECISION RESISTOR, 0.5 ohms, 1%, for use in CS101 tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*PRECISION RESISTOR, 0.5 ohms, 1%, for use in CS109 tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*MISCELLANYSPARK GAP, NEEDLE AND SPHERICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71PULSE SHAPING NETWORK (Use with 7512-1 for 100 S spike) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77ADAPTER FOR TYPE 7021-1 PHASE SHIFT NETWORK, 200 amperes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67ADAPTER TO CONVERT TWO TYPE 8028-50-TS-24-BNC LISNs TO A DUAL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67PULSE STRETCHING NETWORK, (Use with 8282-1 and 7406-1 to obtain 1000 volts, 20 S into 50 ohms) . . . . . . . . . . . . .68INDUCTOR, 1.6 mH, 10 amps, V.D.E. 0871 A1/APR 84 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68CALIBRATION FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35ENGINEER’S CLOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79APPLICATION INFORMATIONTYPE 6693-3L/3R-DC ISOLATOR NETWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75TYPE 7021-1 PHASE SHIFT NETWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73TYPE 7429-1 LOOP ANTENNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51TYPE 9130-1 LOOP ANTENNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56TYPE 9229-1 and 9230-1 LOOP ANTENNAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46HIGH VOLTAGE SPARK TESTS USING TYPE 7115-1 OR 7115-2HIGH VOLTAGE TRANSIENT PULSE TRANSFORMER AND TYPE 7510-1 SPARK GAP . . . . . . . . . . . . .71TYPE 7415-3 R.F. COUPLER AND HIGH PASS FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69CABLE INDUCED TRANSIENTS FOR SPACE SHUTTLE PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77USING THE 6220-1A TRANSFORMER FOR THE MEASUREMENT OF LOW FREQUENCY EMI CURRENTS . . . . . . . . . . . . . . . . .59CALIBRATION OF LOOP ANTENNAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53EMI PREDICTION GRAPH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81* Call for details.6

ESSENTIAL APPARATUS FOR PERFORMING TESTS PER MIL-STD-461D/ETYPE NO. DESCRIPTION6220-1A Audio Isolation Transformer6220-2 Audio Isolation Transformer7032-1 Isolation Transformer, 800 W.7032-2 Isolation Transformer, 800 W.7334-1 Loop Antenna7720-( ) High Pass Filter, 50 ohms8231-*/* Band Reject Filter, 50 ohms8850-1 High Power Sweep Generator, 200 W.9123-1N Current Probe, 10 KHz-500 MHz9125-1 Calibration Fixture, Injection Probe9133-1 ‘Delta’ Capacitor Assembly9142-1N Injection Probe, 2MHz-450 MHz9144-1N Injection Probe, 10 KHz-200 MHz9146-1 ‘Wye’ Capacitor Assembly9207-1 Current Probe, 20 Hz-150 MHz9224-1.0 Precision Resistor, 1.0 ohms9225-0.5 Precision Resistor, 0.5 ohms9226-0.5 Precision Resistor, 0.5 ohms9229-1 Loop Sensor9230-1 Radiating Loop9233-50-TS-50-N LISN9335-2 Multi-Port Coupling Device9357-2 Calibration Fixture9410-1 H.V. Attenuator9454-1 H.V. Attenuator9354-1 Universal Transient Generator9355-1 Pulse Generator9401-1 10 pF Series CapacitorCE CE CS CS CS CS CS RE RE RE RS RS RS101 102 101 109 114 115 116 101 102 103 101 103 105NOTE:x 1x 2x 3x 4Type 6220-1A is rated at 50 amperessecondary current.Type 6220-2 is rated at 100 amperessecondary current.Type 7032-1 is rated at 120 volts, 50-400 Hz,800 W.Type 7032-2 is rated at 240 volts, 50-400 Hz,800 W.High pass filters can be supplied up to50 MHz, 50 ohms.Band reject filters can be supplied up to50 MHz, 50 ohms.Test may require variable frequency modulesType 9554-10K/100KType 9554-100K/1MType 9554-1M/16MType 9554-6M/50MType 9754-35M/85M step frequency module7

ESSENTIAL APPARATUS FOR PERFORMING TESTSin accordance with MIL-STD-461A/B/CTYPE NO. DESCRIPTION6220-1A Audio Isolation Transformer6254-5S RFI Transient Generator, 10S6338-5-PJ-50-N LISN6338-57-PJ-50-N LISN6512-106R Feed-thru Capacitor, 10 F6550-1 Power Sweep Generator, 100 W.6552-1A Audio Amplifier, 100 W.6623-( ) Low Pass Filter, 50 ohms6741-1 EMI Current Probe6920-0.5 Resistive Network7021-1 Phase Shift Network7032-1 (or -2) Isolation Transf., 800W.7054-1 Spike Generator, 10 S7054-1A Spike Generator, 50 S7144-1.0 Precision Resistor, 1.0 ohm7144-10.0 Precision Resistor, 10.0 ohms7205-( ) High Pass Filter, 50 ohms7334-1 Loop Sensor7415-3 R.F. Coupler-High Pass Filter7429-1 Loop Antenna7835-891 Coupling Network7835-892 Coupling Network7835-896 Coupling Network8022-1 Current Probe8282-1 Spike Generator, .15/5/10 S8309-5-TS-100-N LISN8415-1 Precision Resistor, .001 ohm8850-1 Power Sweep Generator, 200 W.9354-1 Transient GeneratorCE CE CE CE CE CE CE CS CS CS CS CS CS CS CS CS01 02 03 04 05 06 07 01 02 03 04 05 06 08 09 10CS CS CS RE RE RE RE RE RE RS RS RS RS RS RS11 12 13 01 02 03 04 05 06 01 02 03 04 05 06NOTE: x 1 . See Notice 3, MIL-STD-462 for CE01 x 3 . Used on B1 aircraft susceptiblity tests.in lieu of current probe. x 4 . Supplies all 3 waveshapes of MIL-STD-461B/C.x 2 . Required by Notice 3, MIL-STD-462, x 5 . Used for Part 2 and 4, U.S. Army (only)U.S. Army Contracts and Notices 5, x 6 . For five microhenry applications above 50 amps.MIL-STD-462, U.S. Navy Contracts.8

MODEL 9354-1 UNIVERSAL TRANSIENT GENERATORfor susceptibility tests MIL-STD461C/D/E, DO-160C/D and other specificationsAPPLICATIONThe Model 9354-1 Universal TransientGenerator was especially designed for theperformance of a variety of pulse susceptibilitytests on subsystems and/or equipment, inaccordance with MIL-STD-461D and E, methodCS116; RTCA DO160D, section 22; MIL-STD-461C,methods CS10 and CS11.Through the use of many Solar accessories,including various reactive networks and couplingdevices, as well as other commercially availableitems such as loop antennas, parallel plates,and TEM cells, the generated output may bemodified and applied to other specifications.(Contact Solar customer service for details.)DESCRIPTIONModel 9354-1 Universal Transient Generatorprovides nine selectable waveforms, includingsix damped sinusoidal pulses (10 KHz, 100 KHz,1 MHz, 10 MHz, 30 MHz, and 100 MHz) andthree double exponential pulses (6.4 S, 70 Sand 500 S).Auto pulsing of the sinusoidal repetition rateis internally adjusted from 0.5 to 1.0 pulse persecond. A front panel-mounted push button canbe used to manually trigger single pulses. Thepeak amplitude of the selected output pulse isadjustable as a percentage of the charge voltage.The six damped sinusoidal waveforms weredesigned to meet the requirements ofMIL-STD-461D and E, method CS116, whenapplied in accordance with the test method ofMIL-STD-462D. Continuous tunable frequenciescan be obtained by the use of the optionalvariable frequency modules.These same waveforms are applicable to therequirements of MIL-STD-461C, methods CS10and CS11, when applied in accordance with thetest method of MIL-STD-462, Notice 5.The 1MHz and 10 MHz damped sinusoidalwaveforms have been extended to a peak opencircuit voltage of 3200 volts and a calculatedshort circuit current of 128 amperes to meetthe requirements of RTCA DO-160D, Section 22,Table 22-2, waveform 3.The three double exponential pulses weredesigned to meet the requirements of RTCADO-160D, Section 22, Tables 22-2 and 22-3.Table 1 lists the test level that can be achievedfrom the Model 9354-1.FEATURES■ Panel-mounted digital voltmeter. Monitors theadjusted open circuit discharge voltage.■ Pulse rates up to two pulses per secondmaximum (factory adjusted).■ Single pulse feature enables controlledisolation of transient effects.■ Output voltage adjustable from 0.1% to 100%of selected discharge voltage.Table 1: DO-160D Test Levels possiblefrom Model 9354-1Waveform Pin Injection Cable BundleInjection1 (70 S) no requirement level 1- 42 (6.4 S) no requirement level 1 - 43 (1MHz & level 1 - 5 level 1 - 410 MHz)4 (70 S) level 1 - 5 level 1 - 45B (500 S) level 1 - 4 level 1 - 39

MODEL 9354-1 UNIVERSAL TRANSIENT GENERATORDOUBLE EXPONENTIAL PULSES(NOTE: MEASUREMENT OF SHORT CIRCUIT CUR-RENTS ARE LIMITED BY THE X L OF THE CIRCUIT.ALL VALUES ARE CALCULATED.)6.4 SRise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 nS.Open Circuit Voltage . . . . . . . . . . . . . . . . . . . .1600 V.Calculated Short Circuit Current . . . . . . . . .800 A.Source Impedance . . . . . . . . . . . . . . . . . . . . . .

MODEL 9554-( ) VARIABLE FREQUENCY MODULESfor use with Model 9354-1 Universal Transient Generator as required byMethod CS-116, MIL-STD-461 Rev. DAPPLICATIONUtilizing the high voltage power source in theModel 9354-1 Universal Transient Generator,four individual modules can be connectedto provide tuning of damped sine waves from10 KHz to 50 MHz. A fifth module is availablewhich, when used in conjunction with the Model9354-1, provides 20% frequency steps from30 MHz to 100 MHz.DESCRIPTIONIndividual modules enable tuning of damped sinewaves in accordance with the requirement ofMethod CS-116, MIL-STD-461 Rev. D. The partnumber of each module indicates the frequencyrange of the module. For example, P/N Type9554-10K/100K indicates a range of 10 KHz to100 KHz. The five modules are identified as:Type 9554-10K/100K variable frequency moduleType 9554-100K/1M variable frequency moduleType 9554-1M/6M variable frequency moduleType 9554-6M/50M variable frequency moduleType 9754-35M/85M step frequency moduleTwo cables connect the module to the Model9354-1. One cable is a single insulated wire tocarry high voltage d.c. to the module. The othercable delivers low voltage d.c. to the module foroperation of relays.OPERATIONThe test setup for calibration of test waveform isindicated in Figure CS116-1, page 79 of MIL-STD-462D. To achieve the required injection current,the digital display on the front panel of the Model9354-1 can be recorded during the calibrationstep for reference and repeated when the actualtest setup is in accordance with Figure CS116-3,page 81 of MIL-STD-462D. This calibration mustbe repeated at each test frequency.The frequency of the damped sine wave isadjusted by a tuning control on the panel of themodule. A graph showing frequency versus turnscount on the tuning control is supplied.With the selected module connected, the chargevoltage of the module is adjusted by the AMPLI-TUDE control on the Model 9354-1 UniversalTransient Generator.The AMPLITUDE knob ismarked in percentage of the available chargevoltage for the module being used.The amplitude and frequency of the damped sinewave into the load can be determined by anassociated oscilloscope with a 50 ohm input.After the charge voltage is adjusted to the desiredvalue, the damped sine wave is applied to theload by pushing the button on the module.USEFUL ACCESSORIESType 9125-1 Calibration JigType 9142-1N Injection ProbeType 9357-1 Calibration JigType 9335-2 Multiple Impedance CouplingDeviceType 9410-1 High Voltage Attenuator (Theinput to the Type 9410-1 can be used for a50 ohm coaxial load as required by MIL-STD-462DFigure CS116-1.)Type 9841-1 1000 Volt Termination, 50 ohmcoaxial 1 W average power. Typical input VSWR ina 50 ohm system under 1.5 from DC to 1 GHz.13

TYPE 9335-2 MULTIPLE IMPEDANCE COUPLING DEVICEimpedance matching injection probeAPPLICATIONVarious EMI specifications require the injectionof high level voltage or current pulses and thereception of low level voltage or current emissionsusing a toroidal transformer or couplingdevice around the interconnecting conductors ofthe subsystems/equipment being tested.The Type 9335-2 Multiple Impedance CouplingDevice is a split toroid, designed as a versatileimpedance matching transformer used in conjuctionwith a generator as an injection probe forconducted susceptibility tests such as methodsCS10 and CS11 of MIL-STD-462, Notice 5; CS116 ofMIL-STD-462D; DO-160C, Section 22, Figure 22-12;and other specifications.INJECTION – High power transient generatorswith source impedances from 0.25 to 50 can use this probe to deliver high peak voltageor high current pulses into the wires or cablespassing through the window of the device.DESCRIPTIONThe unique winding arrangement of this impedancematching probe* provides step-up or stepdownratios with respect to either: 1) the sourceimpedance of the connected generator, whenused for injection, or 2) the load impedance ofthe connected receiver, when used for reception.This results in maximum power transfer intoor out of the transformer winding formed bythe cable bundle passing through the window.The Type 9335-2 Multiple Impedance CouplingDevice provides:1:1.0 voltage or current transfer1:1.5 voltage step-up or current step-down2:1.0 voltage step-down or current step-up1:3.0 voltage step-up or current step-downThese ratios are selected by connecting to oneof the four BNC connectors on the side of theType 9335-2.Figure 1 shows a family of curves representing thetransfer functions for each connector port whenthe device is used as an injection probe.Through connector port selection, the opencircuit voltage or short circuit current can beadjusted for maximum transfer of energy. This isespecially useful as an accessory to the Model9354-1 Universal Transient Pulse Generatorwith its differing source impedances, enablingit to meet various open circuit voltage, and shortcircuit current requirements.CALIBRATIONFor proper calibration of current probes, a specialtest fixture must be used to maintain a 50 ohmcharacteristic impedance for the test signal as itpasses through the window of the probe.The design of the Type 9357-1 CalibrationFixture was carefully tailored to provide a 50 ohmcharacteristic impedance based on the specificdimensions of the Type 9335-2. The fixturemaintains a low standing wave ratio from 10 KHzto 10 MHz in a 50 ohm circuit.* We refer to this unique device as the KnollerProbe, since it is the brainchild of Hank Knoller,an EMC engineer with more than forty yearsexperience in the design and application ofequipment for EMI testing.15

TYPE 9335-2 MULTIPLE IMPEDANCE COUPLING DEVICEdB0PORT 4 (1:3) Rs: 1.2 OHMSPORT 3 (1:1.5) Rs: 2.4 OHMS1020PORT 2 (2:1) Rs: 50 OHMSPORT 1 (1:1) Rs: 25 OHMS30Rs: GENERATOR SOURCE IMPEDANCE1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1010 KHz 100 KHz 1 MHz 10 MHz 100 MHzFIG. 1. INJECTION TRANSFER FUNCTION FOR SEVERAL GENERATOR SOURCE IMPEDANCES.RF GENERATORR S16RF VOLTMETER50 ΩPROBECALIBRATION FIXTURE50 ΩTERMINATIONINJECTION PROBE CALIBRATION

MODEL 9355-1 PULSE GENERATORfor MIL-STD461D/E CS115 susceptibility testAPPLICATIONSolar Model 9355-1 Pulse Generator isdesigned to provide impulse excitation bymeans of an injection probe placed aroundinterconnecting cables or power wires. The unituses a charged transmission line (50 ohms) togenerate a pulse with less than 2 nanosecondsrise and fall time, and duration of approximately30 nS, calibrated in a 50 ohm fixture to deliver upto 5 amperes at a rate of 30 p.p.s. for one minute asrequired by MIL-STD-461D/E, test method CS115.DESCRIPTIONThe charged line potential of the Model 9355-1is adjustable from less than 2 volts to greater than2000 volts. The repetition rate is variable fromless than 0.6 p.p.s. to greater than 150 p.p.s.,or single pulses manually triggered by a panelmounted push button. Digital displays monitorthe charging voltage and pulse repetition rate.This unit can also be used as an impulsecalibrator to provide an adjustable spectraloutput up to 150 dB V/MHz over the frequencyrange of 1 KHz to 10 MHz constant within 1 dB.SPECIFICATIONSOUTPUT PULSE:Charging Voltage: Adj. from 0 to 2000 voltsRise/Fall Time: 2000 V.■ Pulse generator with spectral outputcalibrated in terms of dB V/MHz into a50 ohm load.ACCESSORIES RECOMMENDED FORCS115 TESTINGType 9233-50-TS-50-N Line Impedance StabilizationNetwork.Type 9125-1 Calibration Fixture used tocalibrate probes with a window size from 1.25" to1.50" and a frequency range of 20 Hz to 500 MHz.Type 9142-1N Current Injection Probe with afrequency range of 2 MHz to 450 MHz, 200 W.Type 9123-1 Current Monitor Probe with afrequency range of 10 KHz to 500 MHz, 1.25"window.Type 9410-1 High Voltage 40 dB Attenuator,dc to 1 GHz, 40 dB insertion loss, 2 dB. Can alsobe used as a high voltage, 50 ohm coaxial load.Type 9841-1 1000 Volt Termination, 50 ohmcoaxial 1 W average power. Typical input VSWR ina 50 ohm system under 1.5 from DC to 1 GHz.17

MODEL 8282-1 TRANSIENT PULSE GENERATORfor conducted transient susceptibility testing, 0.15 S - 5.0 S - 10.0 S up to 600 volts (peak)APPLICATIONThe Model 8282-1 Transient Pulse Generatorwas designed for screen room use in makingconducted spike susceptibility tests. It providesall the waveshapes required by MIL-STD-461B/Cand many other military EMI specifications.DESCRIPTIONSpike generators required for susceptibilitytesting have been our specialty since 1962, whenour first unit, the Model 6254-1,was introduced.The Model 8282-1 incorporates all the flexibilityand technical excellence of the previous modelsand provides features required by specificationMIL-STD-461B/C.Three different spike durations are provided:0.15 S, 5.0 S, and 10.0 S. The pulse shapeapproximates the curve of Figure 19 in MIL-STD-462. The amplitude of the spike voltage is fullyadjustable and is displayed on an LED meter.In the series injection mode on 50, 60 or 400 Hzlines, a phase adjustment allows the spike tobe positioned anywhere on the sine wave ofthe power line. This feature makes possible theinjection of interfering transients at selectedpoints in time to determine the susceptibility ofsystems which depend upon frequency or time.The repetition rate of the spike can be adjustedwith a panel control to any rate from 0.5 to 50p.p.s. A single pulse can be injected with the aidof a panel-mounted pushbutton.All functions are selected by pushbuttons whichare lighted when activated.The Model 8282-1 Transient Pulse Generatorprovides up to 600 volts peak amplitude foreach of the 0.15, 5.0 and 10.0 S spikes. Theoutput voltage rises steeply to peak amplitudeas adjusted by the panel control, then fallsexponentially to cross through zero at theduration of 0.15, 5.0, or 10.0 S as selected bypushbuttons. The voltage falls below zero and“rings” for a period determined by the inductancein the output circuit or the load. The peak amplitudedisplayed on the LED meter is the valuethat would appear across a 5.0 ohm noninductiveload.With series injection on 50, 60 or 400 Hz powerlines, the spike can be applied to either thepositive or negative half cycle of the powerfrequency sine wave. The spike can be adjustedto fall on the power sine wave from 0 to 360.For non-synchronous injection, the repetitionrate can be adjusted from 0.5 to 50 p.p.s.A pushbutton enables the “single spike” featureand the spike can be manually triggered bypushing another button. A connector on therear panel makes provision for remote triggeringof the single spike feature.Two methods of remote triggering are provided.One method requires the application of 24 voltsd.c. to trigger the pulse at rates determined byan external switch up to 550 p.p.s. The secondmethod requires the application of a square wavewhich can be used to trigger the spike up to50 p.p.s. for the 0.15 S spike and up to 1000 p.p.s.for the 5.0 and 10.0 S spikes. This latter featurecan be used to trigger the spike in sync with somefunction within the equipment under test.FEATURES■ Provides outputs up to 600 volts peakamplitude for the 0.15, 5.0 and 10.0 S spikesinto a five ohm resistive load (low sourceimpedance).■ A wide range of repetition rates allows spikeinjection in terms of the pulse rates of itemsbeing tested.■ The single pulse feature enables controlledisolation of transient effects.19

MODEL 8282-1 TRANSIENT PULSE GENERATOR■ Adjustable pulse position on a.c. power linesrelates the transient susceptibility to the realtime aspects of digital circuitry served bya.c. power.■ Transients can be injected in synchronism withrepetitive circuit functions as required byMethod CS06 of MIL-STD-462.■ Remote triggering of single or repetitive pulsesin terms of particular system characteristics.■ The upper terminals of the PARALLEL pair andthe SERIES pair provide a positive-going spikeon the 5 S and the 10 S modes. These terminalsdeliver a negative-going spike in the 0.15S mode. When the test plan requires both apositive and a negative spike, it is necessary toreverse the connections to the output terminalsof the Model 8282-1 Spike Generator.SPECIFICATIONSSpike Durations: Pushbutton selectable durationsof 0.15 S, 5.0 S and 10.0 S (20%)to zero crossover, into 5.0 ohm resistive load.PARALLEL INJECTION ON D.C. LINEAdjustable Peak Amplitude: Up to 600 voltsfor 0.15 S, 5.0 S and 10.0 S durations into fiveohm non-inductive load.Internal Impedance: Less than 5.0 ohms for0.15 S, less than 2.0 ohms for 5.0 S, less than1.0 ohm for 10.0 S.Pulse Repetition Rate: Manually adjustable up to50 p.p.s. for all pulse durations.Pulse Shape: Ringing characteristic similar toFigure 19 in MIL-STD-462 when connected tonon-inductive load.Pulse Position: Adjustable from 0° to 360° on50 Hz, 60 Hz or 400 Hz power lines.External Sync Operation: Remotely triggerableup to 50 p.p.s. for 0.15 S, up to 1000 p.p.s. for 5.0and 10.0 S.Amplitude Display: Panel meter is analog LEDdisplay of peak amplitude as it would be intoa five ohm resistive load.SERIES INJECTION ON A.C. LINEPower Current in Series Injection Mode:Handles up to 50 amperes of current at powerfrequencies.Power Requirements: 115 volts 60 Hz, 3.0amperes. (230 volts 50 Hz, 1.5 ampere available.)Size: 12.25" wide , 8.7" high 13" deep. (311 mm x211 mm x 330 mm.)Weight: 30 pounds.USEFUL ACCESSORIESType 7115-2 High Voltage Pulse Transformer.Plugs into SERIES output terminals to providetransient levels up to 15 KV, peak, into Type7510-1 Spark Gap assembly for static discharge tests.Type 7512-1 Spike Injection Probe*Type 7519-1 Pulse Shaping Network*Type 7541-1 Spike Receptor Probe*Type 8282-150 Transient Pulse Transformer.Plugs into SERIES output terminals. Handles upto 150 amperes through the secondary for highcurrent test samples.Type 8525-1 Non-Inductive Five Ohm LoadType 8527-2 Transient Pulse Transformer. Plugsinto SERIES output terminals to provide spikelevels up to 2 KV, peak, into 50 ohms when usingthe ten microsecond function.Type 8908-1 Transient Pulse Transformer. Plugsinto series output to provide up to 600 V spikeinto 50 ohms when using 5 S or 10 S function.Type 9007-1 Transient Pulse Transformer. Plugsinto SERIES output terminals to provide spikelevels up to 1200 V into 50 ohms when using the0.15 microsecond function.* See Application Note on Cable InducedTransients20

MODEL 7399-2 SPIKE GENERATOR 2500 VOLTSfor conducted transient susceptibility testingAPPLICATIONThe Model 7399-2 Spike Generator is a “Big Bang”unit capable of providing high energy spikeswith amplitudes adjustable up to 2500 volts,peak, into low impedance loads, as requiredby paragraph 4.8.5.4 of MIL-E-16400G anddescribed in MIL-STD-1399 Appendices A, B, C,and D.The shape of the spike approximates Figure1 of MIL-STD-1399,Section 103, as shown.DESCRIPTIONModes of operation:■ Repetitive spikes up to 2500 volts peak at twopulses per minute.■ Single non-synchronous spike actuated by apushbutton on the panel.■ Sync functions provide for placing the spike onthe power frequency waveform of 50, 60 or 400Hz power lines. The spike can be moved to anypoint o the sine wave from 0 to 360.A SYNC TEST function is provided for adjustingthe trigger circuit of the associated oscilloscopefor response to a single pulse. After this adjust-ment of the scope, it is ready for viewing thespike.When the READY lamp indicates the storagecircuit has been charged to the selected peakvoltage, the pushbutton is depressed whichtriggers the sync circuit of the oscilloscope.All connections to the Model 7399-2 are isolatedfrom the chassis.The chassis is grounded throughthe third wire in the power cord in accordancewith safety regulations.The Model 7399-2 is provided with two plug-inassemblies which enable it to be configured forseries or parallel injection as described in theappendices of MIL-STD-1399:1) Using the P/N 739945 Plug-in Unit, theequipment is ready for series injection asdescribed in Appendix B of the MIL spec.In this mode, the operation of the Model7399-2 is identical to Model 7399-1.Whenusing the P/N 739945 Plug-in Unit, heavyduty output jacks provide connections inseries with loads up to 100 amperes r.m.s.The mating plugs are well insulated andwill handle power line voltages in excess of500 volts, r.m.s.KV2.52.01.51.00.502) Using the P/N 739950 Plug-in Unit,the equipment can be used for parallelinjection of the spike on single or threephase power circuits as described inproposed Appendices A, C, and D of theMIL spec. This method requires the use ofexternal components determined by thecharacteristics of the item being tested.0 20 40 60OPEN CIRCUIT0.5 OHM LOAD80 100 120MICROSECONDS21

MODEL 7399-2 SPIKE GENERATORSPECIFICATIONSNO LOAD 0.5 OHM LOADPeak Amplitude: 100-2500 V 100-2000 VRise Time: ≈1 S ≈2 SDuration to50% of Peak: ≈50 S ≈31 SDuration toZero Crossover: ≈100 S ≈77 SRepetition Rate: 2 pulses per minute.Phase Adjustment: Spike position adjustablefrom 0 to 360 on 50, 60 or 400 Hz sine wave.Internal Impedance: Less than 0.1 ohm.Peak Output Power: 8 Megawatts into 0.5 ohmload.Power Current in Series Injection Mode:Handles up to 100 amperes of current at powerfrequencies.Power Requirements: 115 volts 60 Hz, 2.0amperes (230 volts 50 Hz, 1.0 ampere available).Size: 21.06" wide, 12.56" high, 15.50" deep(53.5 cm x 31.9 cm x 39.4 cm).Weight: 70 pounds plus 5 pounds for accessories.Total Shipping Weight: 75 pounds.TEST CIRCUIT FOR APPLICATION OF LINE-TO-LINE HIGH VOLTAGE SPIKES TO NAVY EQUIPMENTSUPPLIED BY SINGLE PHASE A.C. POWER. REF.: MIL-STD-1300, APPENDIX B.* Spike duration can be changed from ≈20 S to≈100 S using internal jumpers.ACCESSORIES (Supplied)P/N 739945 Plug-in Unit for series injection ofspike into power lines.P/N 739950 Plug-in Unit for parallel injection(using external components).Mating connectors: Two 100 ampere styles, forpower connections; two 50 ampere styles, forexternal resistor.USEFUL ACCESSORIES (Not Included)Type 6220-1A Transformer. Can be used as ahigh current series inductor.Type 7032-1 Isolation Transformer. For removingpower ground from the case of the scope (seediagram above).22

MODEL 7054-1 SPIKE GENERATOR 600 voltsfor conducted transient susceptibility testing up to 600 volts peakFor those who have graduated from the 50 voltand 100 volt spike susceptibility category, weoffer this high-power 600 volt transient generator.The Model 7054-1 delivers over 300 kw intolow resistance loads. It has the flexibility andcapability of the previous models, includingthe ability to shift the transient in phase to anyposition on the sine wave of the a.c. line feedingthe test sample.The amplitude and the repetitionrate are adjustable.APPLICATIONThe Model 7054-1 Spike Generator wasespecially designed for screen room use inapplying high voltage transients at power lineinputs to electronic equipment. The adjustableamplitude makes it possible to determinethe threshold of susceptibility to spikesappearing on the power line. The Model 7054-1may be used for performing tests perMethod CS06 of MIL-STD-462, Method 5006.1 ofMIL-STD-826A, RTCA D0160D (with impedancematching transformer) various missile specificationsand others.DESCRIPTIONThe peak amplitude of the Model 7054-1 SpikeGenerator is adjustable from 10 volts to over 600volts into 5 ohms. The source impedance is lessthan 0.5 ohm. The transient shape approximatesthe curve given in Figure 19 of MIL-STD-462.Less than one microsecond rise time andapproximately 10 microseconds fall time.On 50, 60 or 400 Hz power lines the transientcan be applied in a periodic manner to thenegative or the positive half-cycle of the powerfrequency. The transient’s relation to the sinewave may be adjusted in phase from 0° to 360°.For non-synchronous injection on either a.c. ord.c. lines, the repetition rate can be adjusted from0.8 p.p.s. to 10 p.p.s. Single transients can beapplied with the pushbutton on the panel.Two sets of output terminals allow either parallelor series injection into the power line. Seriesinjection may be used on d.c. and a.c. lines.Parallel injection is used on d.c. lines only.Theoutput winding used for series injection can carry25 amperes of power current. The outputterminals are isolated from the chassis and thepower cord.SPECIAL MODELSModel 7054-1A.Waveshape falls to zero in approximately50 microseconds. Provides 400 volts peak into5 ohm load. Handles 15 amperes powercurrent.Model 7054-1B.Waveshape falls to zero in approximately120 microseconds. Provides 400 volts peakinto 5 ohm load. Handles 10 amperes powercurrent.FEATURES■ Provides output levels from 10 volts to morethan 600 volts into 5 ohms or less. Deliversmore than 300 kw peak into 0.5 ohm load.■ Adjustable pulse position on a.c. lines relatesthe transient susceptibility to real time aspectsof digital systems.■ Single pulse feature for controlled isolation oftransient effects.■ Output terminals for series or parallelinjection.■ Standard rack panel construction: 7" high, 19"wide, 12.75" deep. (17.78 cm wide, 48.26 cmhigh, 32.38 cm deep.)23

MODEL 7054-1 SPIKE GENERATOR 600 voltsSPECIFICATIONSSpike Amplitude: Continuously adjustable from10 volts to over 600 volts peak.Repetition Rate: Continuously adjustable from0.8 to 10 p.p.s.Rise Time: Less than 1.0 microsecond, into 5 ohmresistive load.Spike Duration: Output falls to zero inapproximately 10 microseconds.Spike Shape: See curve. Similar to Figure 19 ofMIL-STD-462.Phase Adjustment: Spike position adjustablefrom 0° to 360° periodically on 50, 60 or 400 Hzsine wave.Internal Impedance: Less than 0.5 ohm.Output Power: More than 300 kw peak into0.5 ohm load.Power Current in Series Injection Mode:Handles up to 25 amperes of current at powerfrequencies.Power Requirements: 115 volts 60 Hz,1.6 amperes. (230 volts 50 Hz, 0.8 ampereavailable. )Size:Standard rack panel: 7" high, 19" wide, 12.75"deep.(17.78 cm x 48.26 cm x 32.38 cm.)AVAILABLE ACCESSORIESType 7332-1 Transient Pulse Transformer. Plugsinto SERIES output terminals of 7054-1A toprovide spike levels up to 600 volts, peak, into6 ohm load.Type 7406-1 Transient Pulse Transformer.Plugs into SERIES output terminals of 7054-1 toprovide spike levels up to 1200 volts, peak, into50 ohm load.Type 8525-1 Noninductive Five Ohm Load.Type 8527-1 Transient Pulse Transformer. Plugsinto SERIES output terminals of 7054-1 to providespike levels up to 2 KV, peak, into 50 ohm load.TRANSIENT SHAPE INTO FIVE OHM LOADREQUIRED BY MIL-STD-461A/462PARALLEL INJECTION ON D.C. LINESERIES INJECTION ON A.C. LINE24

MODEL 6254-5S RFI TRANSIENT GENERATORfor conducted transient susceptibility testing up to 250 volts, peakThis generation of our well known RFI TransientGenerator incorporates all of the flexibility andtechnical improvements of the previous modelsincluding the ability to shift the transient toany position on the sine wave of a power line.This phase adjustment makes possible theapplication of interfering transients at selectedpoints in time to determine the susceptibility ofsystems which depend upon frequency or timefor correct operation.This transient generated can be synchronizedwith external digital signals over a wide rangeof repetition rates. Also, it can be remotelytriggered by the application of switch controlled24 volts d.c. at rates up to 20 p.p.s.APPLICATIONThe Model 6254-5S RFI Transient Generatorwas especially designed for screen room usein making conducted transient susceptibilitytests as required by military specifications. Thesespecifications include: parts of MIL-STD-461A/462,MSFC-STD-279, Lockheed 422966 (L1011), TRWTOR-1001, Douglas WZZ-7000 (DC-10), and others.DESCRIPTIONThe Model 6254-5S RFI Transient Generatorprovides up to 250 volts peak amplitude.The output transient shape follows the curvegiven in Figure 19 of MIL-STD-462. Less than1.0 microsecond rise time, falling to zero in 8 to 14microseconds, crossing through zero to “ring”in the manner of an inductive transient andreturning to zero again as it “rings.” Theamplitude of the transient is adjustable fromless than 10 volts to over 250 volts peak.Using series injection on 50, 60 or 400 Hz lines,the transient can be applied to the positive or thenegative half-cycle. The transient’s relation tothe sine wave may be adjusted in phase from0° to 360°. For non-synchronous injection, therepetitive rate of the transient can be adjustedfrom 0.5 to 500 p.p.s.For synchronous injection, a square wave inputfrom an external source enables the transient tobe triggered in terms of the digital or pulsecharacteristics of the test sample through therange 0.1 p.p.s. to 800 p.p.s.A panel mounted push-button allows manualinjection of single transients. A rear connectorprovides for remote triggering of single transientsin terms of your system requirements.Output terminals provide for either seriesinjection on AC. lines or parallel injection on d.c.lines as required by specifications. Outputterminals are isolated from chassis and thea.c. line.FEATURES■ Provides outputs from less than 10 volts to over250 volts peak amplitude into high impedanceloads and more than 35 kw into 0.5 ohm load.■ Wider range of repetition rates allows greaterutilization in empirical setups.■ Output terminals for series or parallel injection.■ Single pulse feature enables controlledisolation of transient effects.■ Adjustable pulse position on a.c. lines relatesthe transient susceptibility to the real timeaspects of digital systems.■ Transient may be injected in synchronism withrepetitive circuit functions as required byMethod CS06 of MIL-STD-462.■ Remote triggering of individual or repetitivepulses in terms of particular systemcharacteristics.25

MODEL 6254-5S RFI TRANSIENT GENERATORSPECIFICATIONSSpike Amplitude: Continuously adjustable fromless than 10 volts to more than 250 volts peak.Repetition Rate: Continuously adjustable from0.5 to 500 p.p.s.Rise Time: Less than 1.0 microsecond.Spike Duration: Output falls to zero inapproximately 8 to 14 microseconds.Spike Shape: Ringing characteristic as shown inFigure 19 of MIL-STD-462.Phase Adjustment: Spike position adjustablefrom 0° to 360° on 50, 60 or 400 Hz lines.Sync Operation: Triggers at any rate fromonce every ten seconds to over 800 transientsper second.Internal Impedance: 0.5 ohm.Output Power: More than 35 kw peak into0.5 ohm load.Power Current in Series Injection Mode:Handles up to 50 amperes at power frequencies.Power Requirements: 115 volts 60 Hz, 1.8amperes. (230 volts 50 Hz, 0.9 ampere available.)Size: 8.125" wide, 9" high, 14.625" deep.(20.64 cm x 22.86 cm x 37.15 cm.)AVAILABLE ACCESSORIESType 6254-150 Transient Pulse Transformer.Plugs into SERIES output terminals. Handles upto 150 amperes through the secondary for highcurrent test samples.Type 7115-1 High Voltage TransientTransformer. Plugs into SERIES output terminalsto provide transient levels up to 15 KV peak, intospark gap for static discharge tests.Type 7802-1 Transient Pulse Transformer. Plugsinto SERIES output terminals to provide up to 450volts peak, into 12 ohms.TRANSIENT SHAPE INTO FIVE OHM LOADREQUIRED BY MIL-STD-461A/462PARALLEL INJECTION ON D.C. LINESERIES INJECTION ON A.C. LINE26

MODEL 8850-1 HIGH POWER SWEEP GENERATORfor conducted audio frequency susceptibility testingAPPLICATIONThe Model 8850-1 Power Sweep Generator wasdeveloped in response to the demand forincreased audio voltage from a low impedancesource when performing CS01 ConductedAudio Susceptibility tests per MIL-STD-461B/Cand CS101 conducted susceptibility test perMIL-STD-461D and E. This high power unit isespecially suited for rapidly making tests inthe shielded room.When used with the Type 6220-1A (or 6220-2)Audio Isolation Transformer, the combinationenables the injection of sine wave audio voltagesinto active power lines supplying power to anEquipment Under Test (EUT).DESCRIPTIONThe Model 8850-1 Power Sweep Generatorprovides audio power in a manually tunedor sweeping mode for four frequency bandscovering 30 Hz to 100 KHz. Each band can beswept for one minute, or all bands can be sweptin sequence for one minute. In the manual mode,a tuning knob controls the output frequency.Both the frequency in KHz and the output levelin volts r.m.s. are continuously displayed on twodigital meters on the panel.When used in conjunction with the Type 7021-1Phase Shift Network and the Type 6220-1ATransformer, provision is made for sensingthe audio voltage being injected into the EUTand displaying it on the digital panel meter. Inthis arrangement, the unit maintains a constantinjection level (up to a maximum of 7.5 voltsr.m.s.) as frequency is scanned or swept.Maximum power output of the unit into a1.5 ohm resistive load is over 300 watts and 200watts into 2.5 ohms.The output voltage into a 0.5ohm load connected to the secondary of theassociated Type 6220-1A Transformer can beadjusted to a level in excess of ten volts at 1.0 KHz.FEATURES■ Manual or automatic frequency sweep from 30Hz to 100KHz.■ Digital display of frequency and outputvoltage level or injection voltage level.■■Remote sensing of voltage being injected intothe Equipment Under Test.Automatic leveling of output voltage asfrequency is scanned or swept.■ Protective circuits prevent damage to outputstages caused by power frequency feedback intypical a.c. test setups.■ Low output impedance for greater transfer ofaudio power.■ Up to 300 watts output into 1.5 ohm resistiveload and 200 watts into 2.5 ohms.AVAILABLE ACCESSORIESType 6220-1A Audio Isolation Transformer. Usefor injecting output of 8850-1 in series with powerto test sample as required by test method CS01.Type 7021-1 Phase Shift Network. Use forremoving the power frequency from thevoltmeter in CS01 tests.Type 8810-1 Impedance Matching Transformer.Plugs into output terminals to step up the outputto 50 ohms Impedance. Use when a 50 ohmsignal source is needed.Type 8811-1 Wide Range Transformer. Plugsinto output terminals to provide up to 115 voltsr.m.s. at 200 watts. Use as a power source forfrequencies from 30 Hz to over 2 KHz.Type 9138-1 Step-up Transformer. Plugs intooutput terminals to provide up to 2 KV into 20,000ohm load, 3 KHz to 30 KHz.27

MODEL 8850-1 HIGH POWER SWEEP GENERATORSPECIFICATIONSFrequency Range: 30 Hz to 100 KHz in fourbands, manually tunable or by automatic sweepand continuous display on digital panel meter.Output Power: 300 watts into 1.5 ohms200 watts into 2.5 ohms.Output Voltage: 22 volts r.m.s. maximum at1 KHz.Output Current: 15 amperes maximum at 1 KHz.Output Level: Manually controlled by panelknob. Continuously displayed on digitalpanel meter.Sweep Duration: One minute for one bandor one minute for all four bands selected by pushbuttons.Remote Sense: Automatically maintains outputvoltage at the level set by the operator, up to7.5 volts r.m.s., as frequency is scanned or swept.Frequency Stability: 250 ppm/C.Output Level Drift: Less than 0.5%.Overload Protection: Automatic shut down forexcess temperature, over-voltage, or over-currentconditions in output circuit.Power Requirements: 115 volts 60 Hz, 6 amperes(230 volts 50 Hz, 3 amperes available.)Size: 8.75" wide, 17.25" high, 13" deep.(22.22 cm x 43.82 cm x 33.02 cm.)28

MODEL 6552-1A 100 watt Solid State AUDIO AMPLIFIERfor conducted audio frequency susceptibility testingAPPLICATIONThe Model 6552-1A 100 watt Solid State AudioAmplifier was specifically designed for usewith the Type 6220-1A Audio IsolationTransformer in making conducted audiofrequency susceptibility tests as required byMIL-STD-461A/462 and other EMI specifications.DESCRIPTIONThe Model 6552-1A Audio Amplifier has a widefrequency response and is capable of providingup to 100 watts at 1000 Hz into 2.4 ohms at lowdistortion levels. Requires approximately 0.6 voltsignal input for maximum power output at 1000Hz. Incorporates feedback circuit for flat responsewithin one dB from 30 Hz to 100 KHz at reducedpower levels.posts spaced .75" for standard shielded lead anddouble plug connections.FEATURES■ Solid state.■ Up to 100 watts output.■ Wide frequency range.■ Low input impedance.■ No output transformer.■ Input and output protective circuits.■ Lightweight and portable.AVAILABLE ACCESSORIESType 6220-1A Audio Isolation Transformer. Usefor injecting output of 6552-1A in series withpower to test sample as required by test methodCS01.Type 7032-1 Isolation Transformer. Use forremoving power ground from the case of scopeor voltmeter.Type 7033-1 Impedance Matching Transformer.Plugs into output terminals to step up the normal2.4 ohms to 50 ohms impedance. Use when a 50ohm source impedance is needed.Type 8415-1 Precision Resistor, .001 ohm .25%,100 amperes. Use for accurate measurementof injected audio currents to 10 KHz.SPECIFICATIONSInput Voltage: 0.6 volt for maximum poweroutput at 1000 Hz.Input Impedance: 500-600 ohms.Output Power: 100 watts at 1 KHz into 2.4 ohms.Output Impedance: 2.4 ohms.Output Voltage: 16 volts r.m.s. at 1000 Hz into2.4 ohms (non-inductive).Output Voltage at Secondary of 6220-1A:7.7 volts r.m.s. into 0.6 ohm (non-inductive).Gain Control: Panel mounted input level control.Terminals: Three-way binding posts spaced at.75" for input and output.Fuses: Two a.c. line fuses (5 amps), one d.c. powersupply fuse (5 amps), one output overload fuse(6 amps).Power Requirements: 115 volts 60 Hz, 4.0amperes. (230 volts 50 Hz, 2.0 amperes available.)Size: 8.12" wide, 9" high, 14.62" deep.(20.64 cm x 22.86 cm x 37.15 cm.)Model 7824-1. Rack version of Model 6552-1A.All connections out the rear.Dimensions: 8.75" high x 19" wide x 12.75" deep.(22.22 cm x 48.24 cm x 32.38 cm.)The -3 dB points are 25 Hz and 120 KHz whenusing the 6220-1A Transformer loaded with0.6 ohm. Cleverly designed protective circuitprevents damage due to transients, back EMF,overload or overdrive. Designed for laboratory usewith portable case and conventional binding29

MODEL 6552-1A 100 watt Solid State AUDIO AMPLIFIERVTVMORANALOGVOLTMETER600 AUDIO SUSCEPTIBILITY TEST SETUP FOR D.C. LINESSee back of Data Sheet No. 6550-1 for a.c. power linesVTVMORANALOGVOLTMETERSUGGESTED METHOD OF GENERATING UP TO30 AMPERES IN WIRE SEGMENT FOR SHORT PERIODS, 20 Hz to 5 KHz30

MODEL 6550-1 POWER SWEEP GENERATOR100 watt source for conducted audio frequency susceptibility testingAPPLICATIONThe Model 6550-1 Power Sweep Generator is anunusually versatile instrument which producestriangular, square and sine waves at 100 wattlevels with selectable sweep rates or manualcontrol. This generator is especially suited forrapidly making conducted susceptibility tests onpower line inputs to test samples as required byMIL-STD-461A/462 and other EMI specifications.DESCRIPTIONA switch allows selection of triangular, squarewave and sine wave shapes. The frequency rangeswitch provides ten-to-one ranges from 15 Hz to150 KHz in four steps. The calibrated tuning dialcovers the range for manual tuning. In addition,an automatic sweep selector switch provides tworates of sweep. An output level control adjusts theoutput to any desired level up to 100 watts.Protective circuits prevent damage due to linetransients or overload.Designed for laboratory use with portable caseand conventional binding posts spaced .75"for standard shielded lead and double plugconnections.FEATURES■ Solid state.■ Up to 100 watts output.■ Protective circuit at output.■ Wide frequency range, 15Hz to 150 KHz.■ Manual or automatic frequency sweep.■ Three basic wave shapes: triangular, square, sine.■ Low output impedance.AVAILABLE ACCESSORIESType 6220-1A Audio Isolation Transformer. Usefor injecting output of 6550-1 in series with powerto test sample as required by test method CS01.Type 7021-1 Phase Shift Network. Use forremoving the power frequency from the scopeand voltmeter in CS01 tests.Type 7032-1 Isolation Transformer. Use forremoving power ground from the case of scopeor voltmeter.Type 7033-1 Impedance Matching Transformer.Plugs into output terminals to step up the normal2.4 ohms to 50 ohms impedance. Use when a 50ohm signal source is needed.Type 7035-1 Wide Range Transformer. Plugsinto output terminals to provide up to 115 voltsr.m.s. at 80 watts. Use as a power source forfrequencies from 20 Hz to 10 KHz.SPECIFICATIONSFrequency Range: 15 Hz to 150 KHz.Wave Shapes: Triangular wave, square wave andsine wave.Output Power: 100 watts sine waves at 1000 Hzinto 2.4 ohms (non-inductive).Output Impedance: Approximately 2 ohms.Output Voltage: 16 volts r.m.s. at 1KHz into2.4 ohms (non-inductive).Level Control: Panel mounted output levelcontrol.Sweep Rates: 1 per minute, 10 per per minute, ormanual dial.Terminals: Binding posts with .75" spacing for3-way connection.Power Requirements: 115 volts 60 Hz,4.0 amperes. (230 volts 50 Hz, 2.0 amperesavailable. )Size: 8.12" wide, 9" high, 14.62" deep.(20.64 cm x 22.86 cm x 37.15 cm.)31

MODEL 6550-1 POWER SWEEP GENERATORVTVMORANALOGVOLTMETERAUDIO SUSCEPTIBILITY TEST SETUP FOR A.C. LINESVTVMORANALOGVOLTMETERAUDIO SUSCEPTIBILITY TEST SETUP FOR D.C. LINES32

RFI/EMI CURRENT PROBES AND INJECTION PROBESCURRENT PROBESCurrent probes required by various EMI specifications(such as MIL-STD-461/2) are toroidaltransformers designed to measure r.f. currentson active power lines or other conductors.APPLICATIONA current probe is used as a “pick-up” device formeasuring r.f. current in single conductors orcable bundles when connected to the 50 ohminput of a radio frequency interference measuringreceiver or spectrum analyzer.DESCRIPTIONDirect connection to the conductor carrying EMIcurrent is not necessary, since the probe may beopened for insertion of the conductor into thewindow of the toroid and then closed again toform a toroidal transformer with the conductoracting as a one-turn primary.A correction factor graph is provided to convertmeasured microvolts to EMI microamperes.Whenthe EMI current is measured in dB above onemicrovolt as indicated on a conventional EMImeter, the correction factor will convert themeasurement to dB above one microampere.The correction factor is the inverse of the transferimpedance, Zt. Each probe is shipped with agraph of the correction factor versus frequency,keyed to the serial number on the probe.Under certain conditions, a current probe canbe used to inject low level r.f. signals intoindividual wires or cable bundles. Ask ourengineers for advice in the use of current probesfor this purpose. Some current probes can beeasily damaged or are otherwise unsuitable forthis application.INJECTION PROBESSpecifications require the injection of large highfrequency currents into cable bundles andindividual wires, using inserted secondary toroidaltransformers placed around the conductorsbeing tested.APPLICATIONHigh power r.f. amplifiers with 50 ohm outputimpedance are used to deliver voltage to theinjection probe. The wire or cable through thewindow of the probe acts as a secondary of thetoroidal transformers. This test method isintended to be used instead of earlier methods,such as CS-01, CS-02, and RS-02 of MIL-STD-461.DESCRIPTIONBulk Current Injection Probes are available in twostyles:1. Fixed window style where the wire(s) undertest must be passed through the window.2. A split toroidal design where the probe canbe opened up and clamped over the wire(s)under test.Each probe is calibrated for insertion loss andtransfer impedance in a test fixture designed forthe particular window size.This fixture provides asignal path with a low Voltage Standing WaveRatio. A typical fixture is Solar Type 9125-1,usedfor probes with 32 to 44 mm diameter windows.Ask for details on this and other test fixtures.Injection probes available at the time of thisprinting are described later in this section.Development of new styles is ongoing. If a probemeeting your requirements is not found on thelist, send us details and we will satisfy your need.TECHNICAL INFORMATIONCurrent probes used as receptors are known as“inserted primary toroidal transformers” forconnection to EMI receivers. Injection probeswhich deliver high r.f. currents into wires throughthe window are called “inserted secondarytoroidal transformers”.The maximum voltage carried on wires throughthe window is limited only by the insulation of33

CURRENT PROBES AND INJECTION PROBES (cont.)the wires. Maximum primary current in the wires through the window of current probes is listed on the table below (symbol lp).The signal input to injection probes is rated in watts from the signal source as indicated in the table on the following page.Development is continuing on new and useful probes, both current measuring ”sensor” probes and high wattage injection probes.The following is a partial list.As time goes on, the list will grow. If you do not see what you need, just ask.CLAMP-ON CURRENT PROBESMAXIMUM PRI. (lp) CURRENT, AMPSSOLAR WINDOW NOMINALTYPE NO. DIAMETER ZT OHMS DC to 60 Hz 400 Hz RF (CW) PULSE FREQUENCY RANGE9124-1N 1.25" (32.0 mm) 0.001 200 70 50 5000 1 KHz -200 MHz9204-1 1.25" (32.0 mm) 0.33 350 350 50 100 1 KHz - 8 MHz9205-1 1.25" (32.0 mm) 0.33 800 800 50 100 20 Hz - 8 MHz9118-1 1.25" (32.0 mm) 0.10 350 150 22 500 500 Hz -200 MHz9134-1 1.25" (32.0 mm) 0.70 500 400 5 100 20 Hz -100 MHz6741-1 1.25" (32.0 mm) 0.70 350 225 5 100 10 KHz -100 Mhz9206-1 1.25" (32.0 mm) 1.0 350 350 4.2 100 10 KHz -150 MHz9207-1 1.25" (32.0 mm) 1.0 800 450 4.2 100 20 Hz -150 MHz9208-1 1.25" (32.0 mm) 1.0 350 350 100 200 10 KHz - 30 MHz9209-1 1.25" (32.0 mm) 1.0 800 800 100 200 20 Hz - 30 MHz9145-1 1.25" (32.0 mm) 5 350 350 42 100 10 KHz -150 MHz9119-1N 1.25" (32.0 mm) 1-7 200 200 40 70 1 MHz- 1.2 GHz9123-1N 1.25" (32.0 mm) 1-5 200 200 40 60 10 KHz -500 MHz9115-1N 1.25" (32.0 mm) 10 250 250 50 100 3 MHz-200 MHz9214-1 1.25" (32.0 mm) 5 600 600 21 200 20 Hz -150 MHz9215-1N 1.25" (32.0 mm) 1-5 400 350 40 100 20 Hz -500 MHz9231-1 1.25" (32.0 mm) .010 300 200 7 3000 1 KHz -200 MHz9219-1N 1.25" (32.0 mm) .025 400 300 150 200 20 Hz - 20 Mhz9242-1 1.25" (32.0 mm) .025 400 80 35 100 20 Hz - 20 MHz9250-1N 1.25" (32.0 mm) .10 200 200 10 200 10 KHz -450 MHz9136-1N 2.62" (67.0 mm) 5 350 350 100 200 10 KHz -100 MHz9249-1N 2.62" (67.0 mm) 8 350 350 60 200 10 KHz -300 MHz9256-1N 2.62" (67.0 mm) 2 350 350 200 200 10 KHz - 30 MHz9257-1N 2.62" (67.0 mm) 2 500 500 200 200 20 Hz - 30 MHz9258-1N 2.62" (67.0 mm) 5 500 500 100 200 20 Hz -100 MHz9260-1N 2.62" (67.0 mm) 2 350 75 2.6 100 10 KHz -200 MHz(continued on next page)34

CURRENT PROBES AND INJECTION PROBES (cont.)CLAMP-ON CURRENT PROBES (continued)MAXIMUM PRI. (lp) CURRENT, AMPSSOLAR WINDOW NOMINALTYPE NO. DIAMETER ZT OHMS DC to 60 Hz 400 Hz RF (CW) PULSE FREQUENCY RANGE9261-1N 2.62" (67.0 mm) 2 500 500 2.6 100 20 Hz -200 MHz9262-1N 2.62" (67.0 mm) .03 350 150 80 200 100 KHz - 100MHz9263-1N 2.62" (67.0 mm) .3 500 500 80 200 20 Hz -100 MHz9301-1N 2.62" (67.0 mm) 8 500 500 60 200 20 Hz -500 MHz9302-1N 2.62" (67.0 mm) .001 400 70 100 500 20 Hz -100 MHz9303-1N 2.62" (67.0 mm) .001 500 200 100 5000 20 Hz -100 MHz9304-1N 2.62" (67.0 mm) 1 350 350 2.3 200 10 KHz -200 MHz9305-1N 2.62" (67.0 mm) 1 500 500 2.3 200 20 Hz -200 MHz9306-1N 2.62" (67.0 mm) .005 200 65 60 5000 10 KHz -100 MHz9307-1N 2.62" (67.0 mm) .005 300 300 60 5000 20 Hz -100 MHz9308-1N 2.62" (67.0 mm) .01 300 75 17 2000 10 KHz -200 MHz9309-1N 2.62" (67.0 mm) .01 450 450 17 2000 20 Hz -200 MHzFIXED WINDOW PROBESMAXIMUM PRI. (lp) CURRENT, AMPSSOLAR WINDOW NOMINALTYPE NO. DIAMETER ZT OHMS DC to 60 Hz 400 Hz RF (CW) PULSE FREQUENCY RANGE9218-1 .50" (12.7 mm) .1 10 10 8 100 10 KHz -250 MHz9248-1 .50" (12.7 mm) 1 10 10 10 100 10 KHz - 50 MHz9203-1 .50" (12.7 mm) 1 10 10 2.2 100 10 KHz -250 MHz9211-1 .50" (12.7 mm) .5-3 10 10 5 100 1 MHz- 1 GHz9202-1 .50" (12.7 mm) 5 10 10 10 100 10 KHz -250 MHz9246-1 .50" (12.7 mm) .1 150 150 8 100 10 KHz -250 MHz9253-1 .50" (12.7 mm) 1 150 150 65 100 20 Hz - 50 MHz9245-1 .50" (12.7 mm) 1 150 150 3 100 10 KHz -300 MHz9210-1 .50" (12.7 mm) .3-5 150 150 16 100 300 KHz -500 MHz9212-1 .50" (12.7 mm) .3-4 150 150 30 100 1 MHz- 1 GHz9244-1 .50" (12.7 mm) 5 150 150 13 100 10 KHz -600 MHz9346-1 .50" (12.7 mm) 5 150 150 13 100 20 Hz -600 MHzWe provide equivalents for most Stoddart and Eaton probes.35

CURRENT PROBES AND INJECTION PROBES (cont.)We provide equivalents for most Stoddart and Eaton probes.CLAMP-ON INJECTION PROBESSOLAR WINDOW WINDING RATED INSERTION LOSS FREQUENCYTYPE NO. DIAMETER CURRENT WATTS UNDER 6 dB UNDER 10 dB UNDER 15 dB UNDER 20 dB RANGE9108-1N 1.25" (32 mm) 10 50 — — 120 KHz - 70 MHz 60 KHz - 150 MHz 10 KHz - 200 MHz9120-1N 1.25" (32 mm) 30 50 — 12 MHz - 600 MHz 7 MHz - 900 MHz 4 MHz - 1GHz 4 MHz - 1 GHz9121-1N 1.25" (32 mm) 30 50 — 100 MHz - 550 MHz 50 MHz - 800 MHz 30 MHz - 1GHz 10 MHz - 1 GHz9142-1N 1.50" (38 mm) 50 200 10 MHz - 350 MHz 5 MHz - 430 MHz 2.5 MHz - 500 MHz 1.5 MHz -500 MHz 2 MHz -500 MHz9144-1N 1.50" (38 mm) 26 100 — 200 KHz - 8 MHz 70 KHz - 90 MHz 40 KHz -100 MHz 10 KHz -100 MHz9217-1N 1.50" (38 mm) 26 100 800 KHz - 1.5 MHz 500 KHz - 40 MHz 250 KHz - 100 MHz 150 KHz -100 MHz 10 KHz -100 MHz9310-1N 2.62" (67 mm) 26 100 — 15 MHz - 450 MHz 800 MHz - 650 MHz 4 MHz -800 MHz 5 MHz -800 MHz9607-1N 1.25" (32 mm) 10 50 — 500 KHz - 1 MHz 200 KHz - 30 MHz 120 KHz -300 MHz 10 KHz -300 MHzInjection probes can also be used as current probes. A correction factor graph and instructions for its use are supplied.CALIBRATION FIXTURESNote: Except for p/n 9125-1 and 9357-1, the probes are supported and centered in the fixture.SOLAR PART NO.DESCRIPTION9125-1 For Injection Probes, 1.5" (32 mm - 44 mm) diameter window. 20 Hz to 500 MHz. Type BNC connectors.9125-2 For Solar 9119-1N Probe and similar, 1.25" (32 mm) diameter window. 400 MHz to 3 GHz. Type N connectors.9251-1 For Eaton, Stoddart and Solar Probes, 1.25" (32 mm) diameter window. 20 Hz to 500 MHz. Type BNC connectors.9254-1 For Eaton, Stoddart and Solar Probes, 2.62" (66 mm) diameter window. 20 Hz to 500 MHz. Type N connectors.9321-1 For Eaton, Stoddart and Solar Probes, 0.75" (19 mm) diameter window, totally enclosed. 20 Hz to 1.5 GHz. Type BNC connectors.9330-1N For Eaton, Stoddart and Solar Probes, 1.25" (32 mm) diameter window, totally enclosed. 20 Hz 1.0 GHz. Type N connectors.9357-1 Clam Shell Fixture for Solar 9335-2 Probe. 20 Hz to 100 MHz. Type BNC connectors.36

LINE IMPEDANCE STABILIZATION NETWORKSAPPLICATIONWhen measuring conducted radio interferencevoltages from active power lines to ground, it isessential to know the line impedance so thatrepeatable tests can be made by more than onelaboratory. Artificial line impedances are specifiedin MIL-STD-462, V.D.E., C.I.S.P.R., C22.4, NACSEM5100, ANSI C63.2 and other EMI specifications.The characteristic impedance of the fivemicrohenry and 50 microhenry LISNs bracketsthe mean value of power line impedance whichhas been measured by independent researchers.These two inductance values in parallel withthe 50 ohms of the EMI meter fall between theminimum and maximum line impedance valueswhich have been measured. The mean valuewould be represented by a twenty microhenryinductor in parallel with100 ohms.characteristic. A coaxial connector with d.c.isolation is provided for connection to theassociated frequency selective EMI meter. Thepower source end of the inductor is bypassedto ground.Due to the large current-carrying capability ofsome LISNs, it is not always practical to usea switch for changing inductance values.Instead, some models are equipped with a highcurrent pin plug-and-jack combination for quicklyconnecting and disconnecting a network andsubstituting another.This nylon insulated pin plugand jack arrangement is a safety feature, wellisolated from inadvertent short circuits, providingprotection to operating personnel.Current ratings up to 200 amperes are available in50 H styles and 500 amperes in 5 H styles. Seethe chart on the following page.When measurements are made in a shieldedroom, the LISNs intended for F.C.C. applicationswill also serve for V.D.E. tests. When operating onan unfiltered power line, the V.D.E. specificationsrequire a filter consisting of 250 microhenryinductor and a capacitor. This filter is included inthe 24 ampere LISN, Type 9348-50-R-24-BNC,and the 50 ampere LISN, Type 8602-50-TS-50-N.EMI specifications require one LISN in eachungrounded power lead. Even though the neutralis considered “ground,” if it is not connected tochassis inside the unit under test, the lead mustbe tested with an LISN. Therefore, use two LISNsin d.c. or single phase a.c. applications, three LISNsfor delta-connected three phase circuits, and fourLISNs for ‘Y’ connected three phase circuits.Explanation of Type Numbers8602-50-TS-50-NR.F. connector styleCurrent rating, amperesTerminals: TS = Terminal ScrewPJ = Plug and JackSeries inductance, microhenriesBasic model numberDESCRIPTIONThe Solar Electronics LISNs use a series inductorbetween the test sample and the power sourceto provide the impedance-versus-frequency37

LINE IMPEDANCE STABILIZATION NETWORKSCurrent Inductance Line/Ground Voltage CaseType Number Amps H 50-60 Hz 400 Hz Size* Circuit Frequency Range6330-100-PJ-50-N 50 100 270 130 #3 Single 10 KHz- 4 MHz6330-100-TS-50-N 50 100 270 130 #3 Single 10 KHz- 4 MHz6330-250-PJ-50-N 50 250 270 130 #3 Single 8 KHz- 4 MHz6330-250-TS-50-N 50 250 270 130 #3 Single 8 KHz- 4 MHz6330-600-PJ-50-N 50 600 270 130 #3 Single 7.5 KHz- 5 MHz6330-600-TS-50-N 50 600 270 130 #3 Single 7.5 KHz- 5 MHz6338-5-PJ-50-N 50 5 270 130 #1 Single 150 KHz- 65 MHz6338-5-TS-50-N 50 5 270 130 #1 Single 150 KHz- 65 MHz6338-57-PJ-50-N 50 57 270 130 #2 Single 14 KHz- 4 MHz6338-57-TS-50-N 50 57 270 130 #2 Single 14 KHz- 4 MHz6516-5-TS-10-BNC 10 5 270 130 #5 Single 150 KHz- 65 MHz6516-57-TS-10-BNC 10 57 270 130 #6 Single 14 KHz- 4 MHz7225-1 10 650 270 130 #1 Single 10 KHz-400 MHz (useable up to 1 GHz)7333-5-PJ-50-N 50 5 500 240 #1 Single 150 KHz- 65 MHz7333-5-TS-50-N 50 5 500 240 #1 Single 150 KHz- 65 MHz7333-57-PJ-50-N 50 57 500 240 #2 Single 14 KHz- 4 MHz7333-57-TS-50-N 50 57 500 240 #2 Single 14 KHz- 4 MHz8012-50-R-24-BNC 24 50 135 N/A #1 Dual 10 KHz- 50 MHz8028-50-TS-24-BNC 24 50 270 130 #1 Single 10 KHz- 50 MHz8116-50-PJ-100-N 100 50 270 130 #3‡ Single 10 KHz- 30 MHz8116-50-TS-100-N 100 50 270 130 #3‡ Single 10 KHz- 50 MHz8116-100-PJ-100-N 100 100 270 130 #3‡ Single 10 KHz- 4 MHz8116-100-TS-100-N 100 100 270 130 #3‡ Single 10 KHz- 4 MHz8116-250-PJ-100-N 100 250 270 130 #3‡ Single 8 KHz- 4 MHz8116-250-TS-100-N 100 250 270 130 #3‡ Single 8 KHz- 4 MHz8309-5-PJ-100-N 100 5 500 240 #3 Single 150 KHz- 65 MHz8309-5-TS-100-N 100 5 500 240 #3 Single 150 KHz- 65 MHz8328-50-PJ-50-N 50 50 270 130 #3 Single 10 KHz- 50 MHz, 0.1f coupling capacitor8328-50-TS-50-N 50 50 270 130 #3 Single 10 KHz- 50 MHz, 0.1f coupling capacitor*Case Sizes (w x h x l) #3: 10.06" x 9.0" x 13.12" (25.72 cm x 22.86 cm x 33.34 cm)Add 3" (7.62 cm) for Base Plate #4: 7.53" x 7.63" x 18.97" (19 cm x 19.43 cm x 48.26 cm)‡ With 50 or 60 Hz Ventilating Fan; add 7.09" (18.00 cm) #5: 3.12" x 1.75" x 3.87" (7.94 cm x 4.44 cm x 9.84 cm)#1: 4.5" x 4.5" x 9.25" (11.43 cm x 11.43 cm x 23.5 cm) #6: 2.75" x 2.45" x 5.7" (6.98 cm x 6.22 cm x 14.48 cm)#2: 7.0" x 7.0" x 8.25" (17.78 cm x 11.78 cm x 24.13 cm) #7: 13.06" x 7.0" x 10.06" (33.20 cm x 17.78 cm x 25.55 cm)38

LINE IMPEDANCE STABILIZATION NETWORKS (cont.)Current Inductance Line/Ground Voltage CaseType Number Amps H 50-60 Hz 400 Hz Size* Circuit Frequency Range8410-250-R-24 24 250 270 130 #1 Dual 250H choke network with AC receptacle for usewith 8012-( ) and 9252-( ) for VDE applications8602-50-PJ-50-N 50 50 270 130 #4 Single 10 KHz- 50 MHz w/ 250H choke8602-50-TS-50-N 50 50 270 130 #4 Single 10 KHz- 50 MHz w/ 250H choke8610-50-PJ-100-N 100 50 500 240 #3‡ Single 10 KHz- 30 MHz8610-50-TS-100-N 100 50 500 240 #3‡ Single 10 KHz- 30 MHz8611-50-TS-10-N 10 50 270 130 #2 Single 10 KHz- 30 MHz w/ 250H choke8615-2-TS-100-N 100 2 270 130 #1 Single 1 MHz- 1 GHz8616-5-PJ-200-N 200 5 270 130 #3‡ Single 150 KHz- 65 MHz8616-5-TS-200-N 200 5 270 130 #3‡ Single 150 KHz- 65 MHz8616-50-PJ-200-N 200 50 270 130 #3‡ Single 10 KHz- 50 MHz8616-50-TS-200-N 200 50 270 130 #3‡ Single 10 KHz- 50 MHz8902-5-TS-500-N 500 5 500 240 #4 Single 150 KHz- 1 GHz8905-50-TS-50-N 50 50 270 130 #3 Single 10 KHz-200 MHz8907-250-TS-24 24 250 270 130 #1 Dual 250H choke network with binding posts.For use with two 8028-( ) for VDE applications9106-1300-N-10-N 10 1300 270 130 #1 Single 10 KHz- 1 GHz9117-5-PJ-50-N 50 5 500 240 #1 Single 150 KHz- 1 GHz9117-5-TS-50-N 50 5 500 240 #1 Single 150 KHz- 1 GHz9233-50-PJ-50-N 50 50 270 130 #3 Single 10 KHz- 50 MHz, 0.25F coupling capacitor9233-50-TS-50-N 50 50 270 130 #3 Single 10 KHz- 50 MHz, 0.25F coupling capacitor9247-50-TS-50-N 50 50 500 240 #3 Single 10 KHz- 50 MHz, 0.1F coupling capacitor9252-50-R-24-BNC 24 50 270 130 #7 Dual 10 KHz- 50 MHz, 0.25F coupling capacitor9322-50-R-10-BNC 10 50 270 130 #7 Dual 10 KHz- 50 MHz9331-50-PJ-200-N 200 50 500 240 #3‡ Single 10 KHz- 50 MHz9331-50-TS-200-N 200 50 500 240 #3‡ Single 10 KHz- 50 MHz9345-5-R-10-BNC 10 5 135 N/A #1 Dual 150 KHz- 65 MHz9348-50-R-24-BNC 24 50 270 130 #7 Dual 10 KHz- 50 MHz with 250H choke*Case Sizes (w x h x l) #3: 10.06" x 9.0" x 13.12" (25.72 cm x 22.86 cm x 33.34 cm)Add 3" (7.62 cm) for Base Plate #4: 7.53" x 7.63" x 18.97" (19 cm x 19.43 cm x 48.26 cm)‡ With 50 or 60 Hz Ventilating Fan; add 7.09" (18.00 cm) #5: 3.12" x 1.75" x 3.87" (7.94 cm x 4.44 cm x 9.84 cm)#1: 4.5" x 4.5" x 9.25" (11.43 cm x 11.43 cm x 23.5 cm) #6: 2.75" x 2.45" x 5.7" (6.98 cm x 6.22 cm x 14.48 cm)#2: 7.0" x 7.0" x 8.25" (17.78 cm x 11.78 cm x 24.13 cm) #7: 13.06" x 7.0" x 10.06" (33.20 cm x 17.78 cm x 25.55 cm)39

LINE IMPEDANCE STABILIZATION NETWORKS (cont.)Current Inductance Line/Ground Voltage CaseType Number Amps H 50-60 Hz 400 Hz Size* Circuit Frequency Range9351-5-TS-200-N 200 5 500 240 #3‡ Single 100 KHz- 1 GHz, 150 impedance9403-5-TS-10-BNC 10 5 270 130 #5 Single 150 KHz- 65 MHz9408-50-R-24-BNC 24 50 500 240 #7 Dual 10 KHz- 50 MHz9409-50-R-24 24 50 135 N/A #2 Dual 6 Output Auxiliary, no RF connector9509-50-R-24-BNC 24 50 500 240 #7 Dual 10 KHz- 50 MHz w/ 250H choke9517-50-R-10-BNC 10 50 270 130 #7 Dual 10 KHz- 50 MHz w/ 250H choke9608-50-BP-10-BNC 10 50 500 240 #7 Dual 10 KHz- 50 MHz, binding posts, no switch9615-50-R-25-BNC 25 50 270 130 #7 Dual 10 KHz- 30 MHz, air coil9622-50-BP-10-BNC 10 50 500 240 #1 Single 10 KHz- 50 MHz9623-50-TS-25-BNC 25 50 270 130 #1 Single 10 KHz- 30 MHz, air coil9629-50-TS-25-BNC 25 50 500 240 #1 Single 10 KHz- 30 MHz9632-50-TS-50-N 50 50 270 130 #3 Single 10 KHz- 50 MHz, high wattage for GM spec9702-50-TS-100-N 100 50 270 130 call Single 10 KHz- 50 MHz w/ 250H choke9706-5-TS-250-N 250 5 270 130 #3 Single 150 KHz- 65 MHz9845-50-BP-10-BNC 10 50 135 N/A #1 Dual 10 KHz- 30 MHz, binding posts, no switch9847-50-TS-50-N 50 50 270 130 #3 Single with 20F capacitor9857-50-BP-24-BNC 24 50 135 120 #1 Dual 10 KHz- 50 MHz, binding posts, no switch9861-50-BP-24-BNC 24 50 270 130 #7 Dual 10 KHz- 50 MHz, binding posts, no switch9867-5-TS-50-N 50 5 270 130 #2 Single 10 KHz- 400 MHz w/ 10F capacitor9911-50-R-10-BNC 10 50 135 N/A #1 Dual 10 KHz- 50 MHz9913-50-TS-10-BNC 10 50 270 130 #7 Dual 10 KHz- 50 MHz, 6-32 threaded terminals9924-5-TS-100 100 5 270 130 #3 Isolated 100 KHz- 100 MHz (ISO 7637-2)*Case Sizes (w x h x l) #3: 10.06" x 9.0" x 13.12" (25.72 cm x 22.86 cm x 33.34 cm)Add 3" (7.62 cm) for Base Plate #4: 7.53" x 7.63" x 18.97" (19 cm x 19.43 cm x 48.26 cm)‡ With 50 or 60 Hz Ventilating Fan; add 7.09" (18.00 cm) #5: 3.12" x 1.75" x 3.87" (7.94 cm x 4.44 cm x 9.84 cm)#1: 4.5" x 4.5" x 9.25" (11.43 cm x 11.43 cm x 23.5 cm) #6: 2.75" x 2.45" x 5.7" (6.98 cm x 6.22 cm x 14.48 cm)#2: 7.0" x 7.0" x 8.25" (17.78 cm x 11.78 cm x 24.13 cm) #7: 13.06" x 7.0" x 10.06" (33.20 cm x 17.78 cm x 25.55 cm)40

F.C.C. LINE IMPEDANCE STABILIZATION NETWORKSThe F.C.C. in Part 15 Subpart J has adopted the50 microhenry Line Impedance StabilizationNetwork (LISN) described in Figure 15 of theGerman Document VDE 0876/1/9.78 for use inperforming conducted emission tests on powerlines (10 KHz-30 MHz). (Five microhenry units arerequired for F.C.C. Part 18. See listing on back sideof "LINE IMPEDANCE STABILIZATION NETWORKS"data sheet.) In selecting the appropriate LISN, theimpedance-versus-frequency characteristic is themost important parameter to be considered. Theimpedance curve of the units closely matches theF.C.C. requirements.DESCRIPTIONThe Type 8012-50-R-24-BNC is a dual networkfor use on 120 volt d.c. or 50-60 Hz single phasepower lines. It will handle up to 24 amperesof power current to the equipment under test(EUT). It is fitted with a power cord on one endand a power receptacle on the other end.The receptacle is the style used in the USA withparallel blades and a U shaped grounding pin.A rotary switch selects which of the two powerleads is connected to the BNC r.f. jack for test.Theunused line is terminated in a 50 ohm resistor.The Type 8028-50-TS-24-BNC is a single lineLISN* rated at 270 volts for 50-400 Hz single phaseor three phase test setups. It will handle up to 24amperes of power current to the EUT. This unitis equipped with terminal studs on each end formaking connections to the line and the load.The Type 8328-50-TS-24-BNC is a single lineLISN* with impedance characteristics similar tothe Type 8028-50-TS-24-BNC except rated at50 amperes.The Type 8610-50-TS-100-N is a single line LISN*with impedance characteristics similar to theType 8028-50-TS-50-BNC except rated at 100amperes and uses a Type "N" r.f. connector. Theunit includes a cooling fan with a power cord forconnection to an a.c. power line. Line voltage 115V. 60 Hz or 230 V. 50 Hz must be specified.The Type 8616-50-TS-200-N is a single line LISN*with impedance characteristics similar to theType 8028-50-TS-50-BNC except rated at 200amperes and uses a Type "N" r.f. connector.The unit includes a cooling fan with a power cordfor connection to an a.c. power line. Line voltage115 V. 60 Hz or 230 V. 50 Hz must be specified.NOTE: Part 15 Subpart J, Appendix A describesa line probe which may be used under someconditions in lieu of an LISN. Our Type 8614-1Line Probe satisfies the requirements of paragraphs5.2, 5.6 and Figure 4 of the appendix. OurType 9533-1 Voltage Probe satisfies a similarC.I.S.P.R. 16-1 specification requirement, Subclause12.2, Figure 10.APPLICATIONWhen the associated measuring equipment iseither a spectrum analyzer or EMI meter whichuses electronically controlled solid state attenuators,precautions must be taken.Attenuators ofthis nature use FET semi-conductors whichare readily damaged by transients. Transientsin the setup can be caused by switching thepower to the load or by switching the measuringinstrument from one power lead to another. It isrecommended that a high pass filter be usedbetween the LISN and the EMI meter. If the lowestfrequency to be measured is 10 KHz, the Type7801-8.0 High Pass Filter (8.0 KHz, 50 ohms) issuitable. If the lowest frequency is 150 KHz ormore, the Type 7801-100 High Pass Filter (100KHz, 50 ohms) is recommended. In addition, it isadvisable to disconnect the EMI meter from theLISN before applying or disconnecting the powerto the test sample.For portable equipment, the EUT is isolated fromthe ground plane. For free-standing or equipmentwhich will be permanently installed, the EUT isplaced on the ground plane and electricallybonded to it in a manner which simulates theactual installation. For most consistent test results,the tests should be performed in a shielded room.Two approaches to the test setup are shown onthe next page. Either method complies with therequirements of the F.C.C. docket. The EUT mustbe at least 80 cm (31.5") away from any metallicsurface except for the ground plane. The EMImeter and high pass filter are grounded with theshield of the 50 ohm coaxial cable.*Single line units are needed in each power lead.Use two for single phase or d.c. systems; three fordelta connected three-phase lines; four for Wyeconnected three-phase lines.41

F.C.C. LINE IMPEDANCE STABILIZATION NETWORKSPARALLEL INJECTION ON D.C. LINETYPICAL TEST SETUPS FOR CONDUCTED EMISSIONS42

SPACECRAFT LINE IMPEDANCE SIMULATION NETWORKSThe distinction between Line ImpedanceStabilization Networks and Line ImpedanceSimulation Networks is twofold:a. Simulation networks do not contain an r.f.factor.b. Simulation networks are normally used ond.c. lines only (See the back side of this pagefor a.c.-d.c. units).The acronym LISN is often used for either type ofunit and it is important to provide modifiers todistinguish which unit is being described.Line Impedance Stabilization Networks are usedin many cases to measure the r.f. voltages (fromline-to-ground) conducted on a.c. or d.c. powerleads. They establish a known impedance-versusfrequencycondition over the frequency range ofinterest. These units include an r.f. connector forcabling to an EMI meter or spectrum analyzer toperform the measurement. See catalog page LINEIMPEDANCE STABILIZATION NETWORKS for detailson these units.Line Impedance Simulation Networks are usedfor testing items which will be installed inspacecraft. They establish an impedance-versusfrequencycondition which simulates the d.c.power sources used on satellites and othervehicles operating in a space environment. Theseare dual units with both positive and negativeleads going through. Both lines are isolated fromthe case.Spacecraft designers do not always agree on thecharacteristics of the d.c. power source aboardthe vehicle.The inductance in series with the load,the resistance across the inductor, and the seriesresistance in each leg of the unit are variablesspecified by different spacecraft engineers.In the styles we have provided to date, inductors are used in both sides of the line, except for the twostyles marked with * in the following table.Inductance, Current Resistor ResistanceType Number** microhenries Rating across coil in series7505-4-TS-15-BP . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . 15 A. . . . . . . . . . . 25 ohms . . . . . . 250.0 milliohms8212-4-TS-100-BP . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . 100 A. . . . . . . . . . . 25 ohms . . . . . . . . 0.36 milliohms8312-4-TS-15-BP . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . 15 A. . . . . . . . . . . 25 ohms . . . . . . . 50.0 milliohms† 8509-1-TS-15-BP . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . . . 15 A. . . . . . . . . . . 50 ohms . . . . . . . 82.0 milliohms* 8708-26-PJ-50-X . . . . . . . . . . . . . 26 . . . . . . . . . . . . . . . 50 A. . . . . . . . . . . . None. . . . . . . . . . 9.3 milliohms* 8709-3.5-PJ-50-X. . . . . . . . . . . . . . 3. 5. . . . . . . . . . . . . . 50 A. . . . . . . . . . . . None. . . . . . . . . . 2.8 milliohms† 8712-2-TS-10-BP . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . 10 A. . . . . . . . . . . 50 ohms . . . . . . . 50.0 milliohms† 8718-2-TS-50-BP . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . 50 A. . . . . . . . . . . 50 ohms . . . . . . . 50.0 milliohms8809-1.3-TS-50-BP . . . . . . . . . . . . 1. 35 . . . . . . . . . . . . 50 A. . . . . . . . . . . 25 ohms . . . . . . . . 1.5 milliohms† 8812-2-TS-120-BP . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . 120 A. . . . . . . . . . . 50 ohms . . . . . . . . 2.2 milliohms8901-4-TS-15-BP . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . 15 A. . . . . . . . . . . 25 ohms . . . . . . 250.0 milliohms8903-4-TS-100-BP . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . 100 A. . . . . . . . . . . 25 ohms . . . . . . . . 0.36 milliohms8904-4-TS-15-BP . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . 15 A. . . . . . . . . . . 25 ohms . . . . . . . 50.0 milliohms8910-4-TS-15-BP . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . 15 A. . . . . . . . . . . 25 ohms . . . . . . . . 0.25 milliohms9002-1 . . . . . . . . . . . . . . . . . . . . . . . 0. 9. . . . . . . . . . . . . . . 6 A. . . . . . . . . . . . None . . . . . . . 113.0 milliohms9102-5-TS-10-X. . . . . . . . . . . . . . . . 5 . . . . . . . . . . . . . . . 10 A. . . . . . . . . . . 25 ohms . . . . . . 125.0 milliohms9213-5-TS-50-BP . . . . . . . . . . . . . . 5 . . . . . . . . . . . . . . . 50 A. . . . . . . . . . . 25 ohms . . . . . . . 50.0 milliohms9238-10-TS-50 . . . . . . . . . . . . . . . 10 . . . . . . . . . . . . . . . 50 A. . . . . . . . . . . 25 ohms . . . . . . . . 0.50 milliohms9336-100-TS-100-BP. . . . . . . . . 100 . . . . . . . . . . . . . . 100 A.9344-3/12-TS-50-BNC/PJ . . . . . . 0. 25 . . . . . . . . . . . . 50 A.9350-4-TS-50-N . . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . 50 A.*The return lead (negative) does not contain an inductor.**The letters PJ indicate Plug and Jack power connections.The letters TS indicate Terminal Screw powerconnections.The letters BP at the end of the type number indicate Binding Posts connected across thecoil. This enables the user to connect an oscilloscope across the coil for measuring line transients andripple as required by NASA document SL-E-0002, paragraph 6.20.† In addition to the internal capacitance from line-to-line, these four units require another45,000 F, supplied by an external unit.43

HIGH VOLTAGE, HIGH CURRENT,HIGH FREQUENCYLINE IMPEDANCESTABILIZATION NETWORKSFive microhenry unitTo answer the need to cover the frequencyrange up to 1.0 GHz and to accommodatehigher line voltages and currents, weoffer the Type 8902-5-TS-500-N LineImpedance Stabilization Network. At thelow frequency end of the spectrum, thisnetwork provides the impedance characteristicof all other 5 microhenry units andmaintains the required 50 ohm (20%)impedance up to 1.0 GHz. It is rated at 500v.a.c. and 500 amperes., a.c. It is a singleline unit in an aluminum case measuring7.625" x 7.625" x 19". The line and loadterminals are.5-20 threaded brass studs.The r.f. connector is a conventional Type N.Fifty microhenry unitFor operation up to 100 MHz with a 50microhenry coil, the Type 8905-50-TS-50-N is a Line Impedance StabilizationNetwork rated at 270 v.a.c., 50 amperes.The impedance characteristic meets therequirements at 10 KHz, sloping upwardtoward 50 ohms as frequency increasesand maintains the required 50 ohm(20%) impedance up to 200 MHz.LINE IMPEDANCE SIMULATION NETWORKSFOR A.C. AND D.C. APPLICATIONSIn the application of Line Impedance Simulation Networks, some specifications require that NASA units(4 H) be used on both a.c. and d.c. power circuits. To do this, the large electrolytic capacitor stipulatedfor d.c. applications must be disconnected when the network is used on a.c. lines. Our engineersbelieved that the end-user might not be aware of this detail or would not know whether the capacitorwas in place at the time the test was being set up. A SPECIAL SERIES OF UNITS IS OFFERED WHICHAUTOMATICALLY CONNECT OR DISCONNECT THE CAPACITOR WHEN THE NETWORK IS CONNECTEDTO A POWER LINE.When the power line is 24 to 30 volts d.c., the capacitor is automatically connected into the circuit.However, when the power line is 110 to 115 volts a.c., the capacitor is automatically switched out of thecircuit. Since the switching function is automatic, there is no need to operate a switch or disconnect awire to accomplish this. The end-user does not need to think about it.These innovative combination networks are available in current ratings up to 100 amperes and withspecified resistance values across the coil and differing series resistance in the circuit.Inductance, Current Resistor ResistanceType Number** microhenries Rating across coil in series8901-4-TS-15-BP 4 15 A. 25 ohms 250.00 milliohms8903-4-TS-100-BP 4 100 A. 25 ohms 0.36 milliohms8904-4-TS-15-BP 4 15 A. 25 ohms 50.00 milliohms44

TYPE 9230-1 RADIATING LOOP; TYPE 9229-1 LOOP SENSORfor MIL-STD-461D/RS101 magnetic field testsDESCRIPTIONTest Method RS101 of MIL-STD-461D requiresradiated magnetic fields over the frequency range30 Hz to 100 KHz to determine the susceptibilityor immunity of the equipment under test (EUT).Two loop antennas are required for compliancewith the requirements.The radiating loop is 12 cmin diameter and the sensing loop (used forcalibration) is 4 cm in diameter. The Type 9230-1Radiating Loop has been designed so that theType 9229-1 Loop Sensor can be attached atthe required 5 cm distance.APPLICATIONThe test method requires calibration of theradiated energy at 1.0 KHz prior to the test.Calibration of the Type 9230-1 RadiatingLoop is accomplished by coupling the Type9229-1 Loop Sensor to it at a distance of 5 cm.The arrangement is indicated in Fig. 1 on the nextpage. With a known current flowing in the radiatingloop, the magnetic field can be measured.Two graphs are supplied with the loops to makelife easier for the test engineer. Fig. 2 showsa typical correction factor curve for the Type9229-1 Loop Sensor.Fig. 3 indicates the amountof current flowing through the Type 9230-1Radiating Loop to generate the requiredmagnetic field, in dB/pT.The current level to produce 110 dB/pT at1.0 KHz is 3.0 mA. An accurately calibrated EMImeter or spectrum analyzer will measure thisas 42 dB/µV. Adding the correction factor of68 dB/pT/µV from Fig. 2 equals 110 dB/pT asrequired by the specification.In those instances where the spectrum analyzerdoes not have sufficient sensitivity, the calibrationcan be accomplished just as well at a highercurrent level. For example, using 300 mA, themeasurement would be 82 dB. Subtracting 40 dBfrom this answer and adding the 68 dB factor willequal 110 dB/pT/µV.Another approach to the calibration and themeasurement depends on the accuracy of theEMI receiver. Simply subtract the sensor correctionfactor in dB/pT/µV (Fig. 2) from the desiredmagnetic field level in dB/pT (Fig. 3). Then adjustthe current until the EMI meter reads this valuein dB above one microvolt.Example: For a field of 110 dB/pT at 1.0 KHz,subtract 68 dB (Fig. 2) from this to obtain 42 dB.This value in dB above one microvolt on the EMImeter is equal to 126 µV as indicated in RS101.A typical calibration test setup is shown in Fig. 4a.For current levels below 25 mA, it is feasible touse a standard laboratory signal generator. Forhigher current levels, the signal must be amplified(Fig. 4b). Both methods show a 0.1 ohm precisionresistor (Type 9817-0.1) and a digital voltmeterfor measuring the current.USEFUL ANCILLARY DEVICEType Type 9817-0.1 Precision Resistor, 0.1 ohm,1%. For measuring current flowing in theradiating loop.45

TYPE 9230-1 RADIATING LOOP AND TYPE 9229-1 LOOP SENSOR46

TYPE 7334-1 LOOP ANTENNAfor RE01 and RE101 magnetic emission testsHISTORICAL NOTEThe AT-205/URM-6 Loop Sensor described inTest Method RE01 of MIL-STD-462 is one of theantennas designed for use with the NavyAN/URM-6B and Stoddart NM-10A receivers.These were the low frequency EMI meters that,in 1948, initiated the emphasis on EMI by themilitary departments and created the technicaldiscipline we now know as ElectromagneticCompatibility.DESCRIPTIONThe Solar Type 7334-1 Loop Antenna has beendesigned as a substitute for the AT-205/URM-6antenna and is a replacement for Eaton Model94607-1. It uses 36 turns of wire on a 5.25"(13.3 cm) diameter form enclosed in an electrostaticshield as described in paragraph 5.2.1 ofMIL-STD-461A.The Type 7334-1 is equipped with an epoxy-glassbase plate which serves as a spacer to enable theuser to place the loop at exactly 7 cm from theface of the item under test as required by testprocedure RE01 of MIL-STD-462.APPLICATIONConnection to the loop is through a BNC connectorwhich enables coaxial cabling to the EMIreceiver. The loop is supplied with a correctionfactor graph showing the values in dB whichmust be added to the reading of a 50 ohm EMImeter to obtain answers in either dB/µV/mor dB/pT. The correction factor decreases asfrequency increases from 30 Hz up to approximately15 KHz, where the factor levels off andremains relatively constant up to 5 MHz.The Type 7334-1 Loop Antenna is required byTest Method RE01 in Parts 2 through 6 ofMIL-STD-461C and RE101 of MIL-STD-461D.Theseportions of the specification require magneticfield emission tests of cables, equipments,systems and sub-systems installed in, or used in,all phases of military vehicles, ships, submarines,aircraft (including helicopters), spacecraft, orground-based operations.TEST METHODS RE01 and RE101The Type 7334-1 Loop Antenna is positioned7 cm from the face of the equipment undertest with the plane of the loop parallel to theequipment face. The best position to begin withis opposite or near a joint or seam.The associated EMI meter is then scanned overthe range 30 Hz to 100 KHz searching foremissions. At the frequencies where emissionsare found, the loop antenna is moved about thesurface seeking the strongest emission level.When a strong signal is detected, the loop isoriented on its axis for a maximum reading.This procedure is repeated for all surfaces of theequipment under test. Although the specificationis not clear on the point, it appears to indicatethat all six sides (including the bottom) of anequipment must be tested in this manner.When testing cables, the loop antenna is placed7 cm from the cable with the plane of the loopparallel to the cable. The non-metallic base plateof the Type 7334-1 Loop Antenna provides aconvenient means for establishing the correct7 cm distance.47

TYPE 7334-1 LOOP ANTENNAdB140FACTOR IN dB TO BE ADDED TO EMI METER READING IN dB/VWHEN USING SOLAR TYPE 7334-1 LOOP ANTENNA AS PICKUP DEVICEdB14012012010010080FACTOR FOR dB/uV/M50Ω INPUT80606040FACTOR FOR dB/pT50Ω INPUT402020010 Hz 100 Hz 1 KHz 10 KHz 100 KHz048

TYPE 7429-1 LOOP ANTENNAfor RS01 magnetic field testsAPPLICATIONIn a practical RS01 test setup, the loop antennais supplied with the required current versus frequencyby the Solar Model 6550-1 Power SweepGenerator.The current is measured with a voltmeterconnected across the Solar Type 7144-1.0Precision Resistor which is connected in seriesbetween the loop and the generator.The a.c. current in the Type 7429-1 LoopAntenna to generate the magnetic field intensityrequired by test method RS01 at 5 cm from theloop winding is depicted on a graph suppliedwith the loop. The required current varies from afew microamperes to about 5 amperes as frequencyis adjusted over the range 30Hz to 50 KHz.DESCRIPTIONThe loop antenna used for generating radiatedmagnetic fields is fully described in Figure 1A ofMIL-STD-461A. It consists of ten turns of number16 A.W.G. wire on an insulated form 4.72" (12 cm)in diameter. The winding is placed on the form ina position which allows the form to be used as aspacer to place the winding 5 cm from the face ofthe item under test as required by test methodRS01 of MIL-STD-462.The Type 7429-1 Loop Antenna has beendesigned to the exact requirements of the specification.The loop winding is placed on a durableplastic form and is equipped with banana jackstyle terminals for connection to the test setup.The loop is not shielded.SOLARTYPE 7429-1LOOP ANTENNAVTVMTEST SETUP FOR RS01 MAGNETIC FIELD EMISSIONSSOLARTYPE 7144.-1.0PRECISIONRESISTORSOLARMODEL 6550-1POWER SWEEPGENERATOR49

TYPE 7429-1 LOOP ANTENNA10. AFREQUENCY, HERTZ1 x 10 11.0 ALIMIT FOR PARTS 2, 5, 6AND NAVY PORTION OFPART 4, FIG. 4-14, MIL-STD-461B,PART 4, FIG. 4-16, MIL-STD-461C1 x 10 0.1 A1 x 10 -1.01 A1 x 10 -21.0 mA1 x 10 -3.1 mALIMIT FOR MIL-STD-461AAND FOR ARMY PORTIONOF PART 4, FIG. 4-14, MIL-STD-461B,PART 4, FIG. 4-16, MIL-STD-461C1 x 10 -4.01 mA1 x 10 -51.0 A1 x 10 -60.1 A10 1O0 1K 10K 100K1 x 10 -7A.C. CURRENT IN SOLAR TYPE 7429-1 LOOP ANTENNA TO GENERATETHE MAGNETIC FIELD INTENSITY REQUIRED BY METHOD RS01, MIL-STD-461AAND MIL-STD-461B/C AT 5 CM FROM THE LOOP WINDING.50

Application InformationUSING THE SOLAR TYPE 7429-1 LOOP ANTENNATO ESTABLISH THE MAGNETIC FIELD INTENSITY REQUIRED BY TEST METHOD RS01 OF MIL-STD-461AFORMULA FOR DETERMININGMAGNETIC FIELD INTENSITYIf we grind through the classic formula found onpage 975 of Dr. Fred Terman’s Radio EngineersHandbook (First Edition 1943) we find that theformula simplifies to:( dB/pT 20)I = 2.0 x 10 -8 x 10when using the dimensions of the SolarType 7429-1 Loop and a distance of 5 cmas required by RS01.In other words, plugging in the required dB/pTwill give the current needed through the loop toestablish the magnetic field of the specification.The current-versus-frequency required to meetthe levels specified in the test method RS01 hasbeen determined by this method and plotted onthe graph on the Type 7429-1 catalog sheet.MAGNETIC FIELD INTENSITY ATVARIOUS DISTANCES FROM LOOPOriginally, the Type 7429-1 Loop Antenna wasintended for generating a stipulated magneticfield at a distance of 5 cm as required by TestMethod RS01 of MIL-STD-461A. However, EMIengineers in the field have asked for informationconcerning the amount of current through theloop to achieve magnetic fields at distancesgreater than 5 cm.The graph to the right indicates how the currentthrough the loop varies with distance and withmagnetic field levels which may be required byother programs. For distances greater than 20 cmand a given current, as the distance is doubled,the field intensity becomes 18 dB less. As thedB ABOVE ONE PICOTESLA160140120100806040200.1 A 1 A 10 A 100 A 1 mA 10 mA 100 mA 1 A 10 Acurrent is multiplied by ten, the field intensityincreases by 20 dB. In other words, the fieldSOLAR TYPE 7429-1 LOOP ANTENNA CURRENTLOOP SPACING 55 CMS cm 10 CMS cm20CMS cm40CMS cm80CMS cm1.6MTR m3.2MTR m6.4MTR mintensity change in dB is twenty times the log ofthe change in current at a given distance.51

CALIBRATION OF LOOP ANTENNASINTRODUCTIONThere are at least four different methods ofcalibrating shielded loop antennas. The methoddescribed here is the spaced loop techniquewhere a loop is used as a transmitting antennaspaced a known distance from the loop beingcalibrated.The particular instructions given belowapply specifically to the calibration of the SolarType 7334-1 Loop Sensor used for RE01 andRE04 magnetic field emission tests (MIL-STD-461).BASIC CONCEPTThe test setup is shown in Figure 1. The transmittingloop in this case is the Solar Type 7429-1Loop Antenna, normally used in making RS01magnetic field susceptibility tests. A specific r.f.current is established in the transmitting loop,measured with a series resistor and a voltmeter.At a given distance away, the field intensitygenerated by the current in the loop can becalculated. In the setup shown, for a distanceof 13.25" (33.65 cm) from the periphery of thetransmitting loop winding to the center ofthe receiving loop winding, the field intensityis calculated to be 178 volts-per-meter whena current of one ampere is flowing in thetransmitting loop.SETUP DETAILSSince dimensions are critical, it is important torecognize that the 13.25" (33.65 cm) is not thedistance between the edges of the loops, but isfrom the periphery of the Type 7429-1 loopwinding to the center axis of the Type 7334-1loop.These end points are not readily determinedbecause the Type 7429-1 loop winding is insidea piece of plastic and the center of theType 7334-1 loop winding is difficult todetermine due to the metal shield. Figure 2shows a dimension of 10.65" (27 cm) between thefaces of the loops when the 13.25" (33.65 cm)dimension is established at the theoretical points.In setting up this dimension, take care to maintainthe loops on the same axis and to orient themto face each other in a parallel fashion. A nonmetallicfixture should be used to maintain theproper physical conditions. The setup shouldbe arranged so that no metallic objects are inthe vicinity of the loop antennas. The signalgenerator and the EMI meter should be atopposite ends of the setup so that the EMImeter is not receiving the signal by some otherpath than by way of the Type 7334-1 loop.ELECTRICAL DETAILSIt is not possible to obtain one ampere ofr.f. current in the transmitting loop over therange of 30 Hz to 30 KHz with an ordinarysignal generator. Figure 1 shows the SolarModel 6550-1 Power Sweep Generator beingused to deliver the required current level.When the physical dimension is maintained andthe current through the loop is adjusted at eachtest frequency, the voltage received by the Type7334-1 loop is measured with the EMI meter.In most test locations there are strong magneticfields at the power frequency and its harmonics.It is desirable to avoid these frequencies by usinga very narrow bandwidth in the EMI meter. Asimple check on the validity of the received levelwould be to disconnect the signal generator fromthe transmitting loop. If the received signal is stillpresent, the signal is arriving at the Type 7334-1loop from some other source.DETERMINING LOOP FACTORSIt is desirable to obtain the correction factor forthe loop in decibels, since the limits of RE01 arein terms of decibels above a picoTesla. For thisreason it is convenient to measure the receivedvoltage in dB above (or below) one microvolt.The field intensity in this setup is 177.83 voltsper-meter(165 dB/V/meter) which equatesto 115.5 dB/pT. The measured level at eachfrequency in dB/V is subtracted from 165 toobtain the correction factor for field intensity indecibels with reference to one micro-voltper-meter(dB/V/m). The measured level issubtracted from 115.5 to obtain the correctionfactor for field intensity in decibels with referenceto one picoTesla (dB/pT).As an example, assume that the EMI meterreading is 82 dB/V at 10 KHz. Subtracting 82from the 165 reference yields 83, the factorfor field intensity in dB/V/m.53

CALIBRATION OF LOOP ANTENNASAt this frequency, the 83 dB factor must be addedto the EMI meter reading to obtain the finalanswer in dB/V/m.For answers in volts-per-meterReference 165.EMI meter reading _____ – 82.Field Intensity: 83. dB/V/mWhen the answer is to be in dB/pT, derive thefactor by subtracting the 82 dB in this examplefrom 115.5 to yield a correction factor (in dB)of 33.5.For answers in TeslasReference 115.5EMI meter reading ______ – 82.0Field Intensity: 33.5 dB/pTWhen using the Type 7334-1 loop in the RE01test, add the 33.5 correction to the EMI meterreading (in dB) to obtain the field intensityexpressed in dB/pT.CONVERSION TO OTHER TERMSTo convert V/m to picoTeslas, multiply by3.33 x 10 -3 .To convert pT to V/m, multiply by 3 x 10 2 .To convert dB/V/m to dB/pT, subtract 49.5 dB.To convert dB/pT to dB/V/m, add 49.5 dB.Where: E=electric field intensity in volts-permeterat the center of the receivingloop.N= number of turns in the transmittingloop.d=diameter of transmitting loop, inmeters.l = r.f. current flowing in the transmittingloop, in amperes.D= hypotenuse distance “h” from theperiphery of the Type 7429-1 loopwinding to the center of the Type7334-1 loop at the axis in meters.FIG. 2 PHYSICAL PLACEMENT OF LOOPSREFERENCE INFORMATIONThe following expressions may be used inchecking the accuracy of this test methodand may be used in obtaining values for testingloop antennas of other types.E = (47.15 N d 2 I) D 3VTVMORANALOGVOLTMETERFIG. 1 BASIC TEST SETUP54

TYPE 9130-1 LOOP ANTENNAfor receiving or generating magnetic fields, 10 KHz to 3 MHzDESCRIPTIONThis antenna was designed as a replacement forEaton 94608-1. It is similar to Stoddart 91117-2,30-inch diameter loop, supplied with AN/URM-6Band NM-10A EMI receivers. In addition to operatingas a receiving antenna, the Type 9130-1 LoopAntenna is capable of carrying ten amperes intest setups for generating magnetic fields.Although the antenna it is replacing is circular(30 inches in diameter), the Type 9130-1 LoopAntenna is almost square, 28.5" x 29.75" with6.31" radius at each corner (12.4 cm x 75.5 cmwith 16 cm radius). This larger area results in animproved pickup factor. The loop is wound withlarger wire than the original, so that it can carrymore current in the transmitting mode. Fittedwith Type N connector.APPLICATIONAs a receiving antenna the Type 9130-1 ismore sensitive than the original 30-inch diameterloops. The graph below shows the comparisonwhen connected to a receiver with 50 ohminput impedance.When used to generate magnetic fields, the Type9130-1 Loop Antenna is capable of carrying upto ten amperes through its eleven turns, making110-ampere turns. With one ampere flowingthrough the winding, the magnetic fieldgenerated is over 277.5 volts-per-meter atone meter distance from the plane of theloop and 12.6 volts-per-meter at three metersdistance. With ten amperes flowing, the fieldintensity is 126 volts-per-meter at three metersdistance.60dB50STODDART AT206/URM6, 91117-2SOLAR TYPE 9130-1401 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 35510 KHz 100 KHz 1 MHzCORRECTION FACTOR IN dB FOR LOOP INTO 50 OHMS TO OBTAIN dB/µ V/M

APPLICATION INFORMATION FOR TYPE 9130-1 LOOP ANTENNAThe Type 9130-1 Loop Antenna can be used forreceiving radiated magnetic fields as well asgenerating a stipulated magnetic field at aspecified distance. The generated magnetic fieldis a function of the current flowing in theloop and the distance from the loop to the pointof measurement.The graph on this page indicates how the currentthrough the loop varies with distance andmagnetic field levels. For 18 dB increase in fieldintensity at a given current, the distance is dividedby two. Conversely, at a given current as thedistance is doubled, the field intensity becomes18 dB less. As the current is multiplied by ten,the field intensity increases by 20 dB. In otherwords, the field intensity change in dB is twentytimes the log of the change in current at a givendistance.Note that the Type 9130-1 Loop Antenna iswound with wire suitable for carrying up to tenamperes. For higher currents, apply the currentfor short intervals. Allow the winding to cool off.dB/pT120DISTANCE FROM CENTER OF LOOP, METERS0.5 M1.0 M2.0 M4.0 M1008.0 MFIELD STRENGTH dB/pTNOTE: Add 49.5 to DB/pT to obtain dB/V/M.80604020016 M32 M64 M128 M256 M–2010A 100A 1mA 10mA 100mA 1A 10AAMPERES THROUGH TYPE 9130-1 LOOP WINDING56

TYPE 6220-1A AUDIO ISOLATION TRANSFORMERfor conducted audio frequency susceptibility testingAPPLICATIONThe Type 6220-1A Audio Isolation Transformerwas especially designed for screen room usein making conducted audio frequency susceptibilitytests as required by MIL-STD-461/462 andother EMI specifications.The transformer may also be used as a pickupdevice to measure low frequency EMI currents atlower levels than conventional current probes.In addition, its secondary may be used as anisolating inductor in the power line duringtransient susceptibility tests. (See ApplicationNote AN622001.)Another secondary winding is connected to apair of binding posts suitable for connecting toa.c. voltmeter as directed by the applicableEMI specifications. This winding serves to isolatethe voltmeter from power ground. Neither theprimary nor the secondary windings areconnected to the end bells of the core. Thetransformer may be used as a 4-ohm primary and1-ohm secondary or 2.4-ohm primary and0.6-ohm secondary or 2-ohm primary and0.5-ohm secondary.FEATURES■ Provides a convenient bench model unitwith three-way binding posts on primaryand output voltmeter leads. Standard 0.75"spacing of binding posts allows use ofstandard plugs. High current secondary uses1/4-20 threaded studs.■ Capable of handling the audio power requiredby EMI specifications and up to 50 amperes ofa.c. or d.c. through the secondary in series withthe test sample.■ May be used as a pickup device or an isolatinginductor in other tests.■ Suitable for fastening to the bench top inpermanent test setups.ADDITIONAL MODELSType 6220-2 100 amperes high currenttransformer.Type 6220-4 50 amperes 4 KV transientvoltage HV transformer.Type 9707-1 10 amperes low currenttransformer.SPECIFICATIONSPrimary: Less than 5 ohms.Secondary: One-fourth the primary impedance.Frequency Response: 30 Hz to 250 KHz.Audio Power: 200 watts.Dielectric Test: 600 volts d.c. primary tosecondaries and each winding to end bells.Secondary Saturation: 50 amperes a.c. or d.c.maximum.Turns Ratio: Two-to-one step down.Secondary Inductance: Approximately 1.0 mH(unloaded).Weight: 18 pounds.Size: 4.5" wide, 5.25 " high, 6.25" deep plusterminals. (114 mm x 133 mm x 159 mm.)DESCRIPTIONThe transformer is capable of handing up to 200watts of audio power into its primary over the frequencyrange 30 Hz to 250 KHz. The turns ratioprovides a two-to-one step down to the specialsecondary winding.The secondary will handle upto fifty amperes of a.c. or d.c. without saturatingthe transformer.57

TYPE 6220-1A AUDIO ISOLATION TRANSFORMERSOLAR8850-1 or 6550-1POWERSWEEPGENERATORAUDIO SUSCEPTIBILITY TEST SETUP FOR D.C. LINESSOLAR8850-1 or 6550-1POWERSWEEPGENERATORTEST SETUP FOR MEASURING LOW FREQUENCY, LOW AMPLITUDE EMI CURRENTSee Application Note 62200158

APPLICATION NOTE AN622001USING TYPE 6220-1A TRANSFORMER FOR THE MEASUREMENT OF LOW FREQUENCY EMI CURRENTSINTRODUCTION“There is more than one way to skin a cat” yourgreat grandfather and my father used to say. Theevolution of methods of measuring conductedinterference illustrates this homely expression in adistorted kind of way.To start with, a clever and versatile propulsionengineer named Alan Watton at Wright Field earlyin WWII created an artificial line impedance whichrepresented what he had measured onthe d.c. buss in a twin-engined aircraft. Probably aDC-3, but memory is dim on this point. Watton’swork was sponsored by a committee headed byLeonard W. Thomas (then of Buships) with activeparticipation by Dr. Ralph Showers of Universityof Pennsylvania and others.So the Line Impedance Stabilization Network(LISN) was born. It was a pretty good simulationof that particular aircraft and the electricalsystems it included. But then someone arbitrarilydecided to use this artificial impedance torepresent any power line.At any rate, this impedance suddenly beganappearing in specifications which demandedits use in each ungrounded power line fordetermining the conducted EMI (then known asRFI) voltage generated by any kind of a gadget.The resulting test data, it was argued, allowed thegovernment to directly compare measuredRFI/EMI voltages from different test samples anddifferent test laboratories. No one was concernedabout the fact that filtering devised for suppressingthe test sample was based on this artificialimpedance in order to pass the requirements, butthat the same filter might have no relation toreality when used with the test sample in itsnormal power line connection.Not until 1947, that is. At that time, this sameAlan Watton, a propulsion engineer having noconnection with the RFI/EMI business, decidedto rectify the comedy of errors which hadmisapplied his original brainchild. He was in aposition to place a small R and D contract withStoddart for the development of two probes;a current measuring probe and a voltagemeasuring probe. Obviously, he felt that oneneeded to know at least two parameters for a trueunderstanding of conducted interference. Thecurrent probe is not only a measure of EMIcurrent, it is a measure of the magnetic fieldradiation from the wire or cable under test. Thisis a more meaningful measure of magneticradiation, particularly at the lower frequencies,since the coupling between power leads at lowfrequencies is inductive, not capacitive.As it turned out, Stoddart was successful indeveloping a current probe based on AlanWatton’s suggestions regarding the torodialtransformer approach which is still the primarybasis used today. However, the development ofthe voltage measurement probe suffered for lackof sensitivity. Watton’s hope had been to providea high impedance voltage probe with bettersensitivity than was then available for measurementreceivers designed for rod antennas and50 ohm inputs. Since this effort failed andWatton’s funds (and probably his interest in thesubject) faded out of the picture, the programcame to a halt.This meant that the RFI/EMI engineer could eithermeasure EMI voltage across an artificial impedancewhich varied with frequency, or he couldmeasure EMI current flowing through a circuit ofunknown r.f. impedance. Either way, the wholestory is not known. In spite of the unknownimpedance, the military specifications beganpicking up the idea of measuring EMI currentinstead of voltage.The test setup was simpler andthe current probe was not as limited as the LISNin its ability to cope with large power linecurrents. And the current probe measurementwas also a measurement of magnetic field59

AN622001 (continued)radiation. The current probe was somewhatbetter than the LISN for measurements below150 KHz and above 25 MHz but, even so, thetechnique was not very sensitive at the lowerfrequency end of the spectrum.A young Boeing EMI engineer named FrankBeauchamp was the first to apply the currentprobe to wideband measurements from 30 Hz to20 KHz. He was smart enough to realize some ofthe problems in this range so he incorporated thesliding current probe factor into the method ofmeasurement he spelled out in the MinutemanSpecification, GM-07-59-2617A. The test methodrequired that the probe factor existing at 20 KHzshould be used for obtaining the widebandanswer in terms of “per 20 KHz” bandwidth. Thismeant that the specified limit was not a constantthroughout the 20 KHz bandwidth, but wasvarying as the inverse of the probe factor. A verysensible solution at the time. Regrettably, laterspecifications did not follow this lead.When later EMI specifications extended the needfor measurement of EMI currents down to 30 Hzwithout taking into account the sloping probefactor, the problem of probe sensitivity becamecritical. Attempts to compensate for the poorcurrent probe response at low frequencies byusing active element suffer from dynamic rangedifficulties and the possibility of overload.This led to another way of “skinning the cat,” withthe aid of the Audio Isolation Transformer alreadyavailable and in use for susceptibility testing.The technique described in the followingparagraphs indicates how to obtain considerablygreater measurement sensitivity for conductednarrowband EMI currents and a means for obtaininga flat frequency characteristic without the useof active elements for broadband or “wideband”EMI current measurements.BASIC CONCEPTThe application described herein has grown outof a suggestion by Sam Shankle of Philco Ford inPalo Alto. He and his capable crew first tried thisscheme using H-P Wave Analyzers as the associatedvoltmeter. Our work with the idea hasconcentrated on conventional EMI meters with50 ohm inputs.Basically, the test method consists of using thesecondary (S) of the Solar Type 6220-1A AudioIsolation Transformer as the pickup device.The transformer winding normally used as theprimary (P) is used as an output winding in thiscase. The method provides a two-to-one step upto further enhance the sensitivity.USE OF THE TYPE 6220-1ATRANSFORMER IN GENERALSince the transformer is connected in series witheach ungrounded power input lead (sequentially)for performing the audio susceptibility tests, it canbe used for two additional purposes while still inthe circuit. First, the secondary winding can actas the series inductor suggested for transientinjection tests to prevent the transient from beingshort-circuited by the impedance of the powerline. In this application all other windings are leftopen. See Figure 1. Secondly, the transformercan be used for measuring EMI current asdescribed herein. See Figure 2. At other times, ifit is not needed in the circuit, short cicuiting theprimary winding will effectively reduce thesecondary inductance to a value so low that thetransformer acts as if it isn’t there.ACHIEVING MAXIMUM SENSITIVITYFOR CONDUCTED EMI CURRENTMEASUREMENTSThe basic circuit in Figure 2 provides the mostpickup and transfer of energy over the frequencyrange 30 Hz to 150 KHz. Curve #1 of Figure 3shows the correction factors required to convertnarrowband signals to dB above one microampere.Since the sign of the factor is negative formost of the range, the sensitivity is considerablybetter than that of conventional current probes.The sensitivity achieved by this technique isbetter than .05 microamperes at frequencies60

AN622001 (continued)above 5 KHz when using an EMI meter capable ofmeasuring 1.0 microvolt into 50 ohms. For EMImeters such as the NM-7A and the EMC-10E,the meter sensitivity is a decade better andit is possible to measure EMI currents of.005 microamperes at 5 KHz and above.FLATTENING THE RESPONSEAt a sacrifice of sensitivity, the upper portion ofthe frequency vs. correction factor curve can beflattened to provide a constant correction factorfrom about 1 KHz up to 150 KHz. This is depictedin curve #2 of Figure 3, where a -20 dB correctionis suitable over this part of the frequency range.The flattening is obtained by loading the primarywith a suitable value or resistance. The resistancevalue used in this example is 10 ohms. Theflattening still allows the measurement of a0.1 microampere signal when using an EMI meterwith 0.1 microvolt sensitivity. An advantageof this response curve is the sloping correctionat frequencies below 1KHz which acts like a highpass filter to remove some of the power lineharmonics from wideband measurements.If you are only interested in frequencies above150 Hz, a 2 ohm resistor is all that is needed. Seecurve #3.STILL MORE FLATTENINGLike the girdle ads say, you can firmer and flatter,with a loss in sensitivity , by further reducing thevalue of the shunt resistor. This is illustratedin curve #4 of Figure 3 where a 0.5 ohm shuntresistor (Solar Type 6920-0.5) is connectedacross the transformer primary winding used asan output winding to the EMI meter. The overallflatness is achieved at the sacrifice of considerablesensitivity, but the sensitivity is well under therequirements of existing specifications and thecorrection network utilizes no active elements.+20+100–10–20dB TO BE ADDED TO EMIMETER READING (IN dB) TOOBTAIN dB / A.–3010 100 1KFREQUENCY HERTZ10KLIMITATIONS OF THE METHODWhen measuring EMI current on d.c. lines, thereare no problems, but on a.c. lines there are limitations.The a.c. voltage drop across the winding (S)due to power current flowing to the test sampleis the principal problem. This voltage inducestwice as much voltage in the output winding (P)at the power frequency. Since we prefer to limitthe power dissipation in the 50 ohm input to theEMI meter so that it will not exceed 0.5 watts, theinduced voltage must be kept below a safe limit.For 400 Hz lines, the power frequency currentmust not exceed 16 amperes to avoid too much400 Hz power dissipation in the input to the EMImeter. Also, the resistance ‘R’ used across theoutput winding (P) must be at least a 50 wattrating on 400 Hz lines. This resistor should benoninductive to avoid errors due to inductivereactance.FIGURE 3 – TYPICAL CORRECTION DATA VS. FREQUENCY100KCURVE #4R0.5 OHMCURVE #3R2 OHMSCURVE #2R10 OHMSCURVE #1R=∞THINGS TO BE WARY OFThe 10 F feed-thru required by presentday specs has appreciable reactance at 30 Hz(54 ohms) and acts to reduce the actual EMIcurrent flowing in the circuit. This means lesstrouble in meeting the spec, but when calibratingthe test method described herein, it is wise toshort circuit the capacitor.In the case where the input circuit to theEMI meter is reactive, such as the EMC-10E, it isnecessary to use a minimum loss ‘T’ pad atthe input to the meter. The Eaton NM-7A andNM-12/27A units do not require this pad andits loss.DETERMINING THE NARROWBANDCORRECTION FACTORThe test setup of Figure 4 describes the simplemethod of determining either the transfer1M61

AN622001 (continued)impedance or the correction curve, whichever isdesired. Actually, there is no need to plot theanswer as transfer impedance, since the desiredend product is the correction factor to be appliedto the meter reading to obtain decibels aboveone microampere. The correction must beobtained for each configuration. In other words,if you want to use the method for maximumsensitivity, the calibration is performed with justa 50 ohm load on the primary winding simulatingthe EMI meter. If the flattening networks will beused, then they must be connected to the primarywinding during the calibration and must befurther loaded with 50 ohms to simulate the EMImeter input.At each test frequency, the output of the audiosignal generator is adjusted for a level whichdelivers the same current to the secondary (S) ofthe transformer.This is accomplished by setting aconstant voltage across the 10 ohm resistor. Aconvenient level is 0.1 volt across 10 ohms whichis 10,000 microamperes (80 dB/uA).Adjust the gain of the EMI meter to assure a onemicrovolt meter reading for a one microvolt R.F.input from a standard signal generator. Thenconnect the 50 ohm input circuit of the EMI meterto the primary of the 6220-1A. If the EMC-10E isused, insert a 10 dB pad in series with the input. Ifthe calibration is for maximum sensitivity, noadditional loading is necessary. If the calibrationis for the flattened versions discussed above, theappropriate resistance must be connected acrossthe primary of the transformer.At the frequency of the test, set the output of thesignal source to obtain 1.0 volt across the 10 ohmresistor. Carefully tune the EMI meter to the testfrequency and note the meter reading on the dBscale. The difference between the meter readingin dB and 80 dB represents the correction necessaryto convert the meter reading to dB aboveone microampere for narrowband measurements.In most cases, the correction will have a negativesign. For example, at 100 Hz the EMI metermay read 88 dB above one microvolt. Since thereference is 80 dB above one microampere, thecorrection is -8 dB to added algebraically tothe meter reading to obtain the correct readingin dB above one microampere.If the 10 dB pad has been used, this loss must beaccounted for in deriving the correction. If thepad will be used in the actual test setups, its lossbecomes part of the correction factor. In this case,the meter reading obtained in the foregoingexample would be 78 dB above one microvoltand the correction factor would be +2 dB fornarrowband measurements.Repeating this procedure at a number of testfrequencies will produce enough data to plota smooth curve for use when actual tests arebeing conducted.DERIVING THE BROADBANDCORRECTION FACTORWhen making broadband measurements asrequired by MIL-STD-461A in terms of “dB aboveone microampere per megahertz,” use theaverage of the narrowband factors over the range30 Hz to 14 KHz and add a bandwidth correctionfactor of 37 dB.In the case of Method CE01 of MIL-STD-461A, usethe 20 KHz wideband mode of the EMI meter,determine the average of the narrowband factorsover the range 30 Hz to 20 KHz and use this figureas the bandwidth correction factor.When using high pass filters at the input to theEMI meter to eliminate the first few harmonicsof the power line frequency as allowed byFIGURE 4 – TEST SETUPFOR DETERMINING CORRECTION FACTORMIL-STD-461A, the range covered will dependupon the cutoff frequency of the filter. Forexample, on 60 Hz power lines and using SolarType 7205-0.35 High Pass Filter betweenthe 6220-1A Transformer and the EMI meter,obtain the average narrowband correctionbetween 350 Hz and 14 KHz and add the bandwidthcorrection factor of 37 dB. On 400 Hz lineswhen using the Solar Type 7205-2.4 High PassFilter between the transformer and the EMImeter, determine the average of the narrowbandfactors in the range of 2.4 KHz and 14 KHz andadd the bandwidth correction factor of 38.5 dB.SUMMARYSome of the material given in this ApplicationNote is terse and given without much explanation.If your are confused by this simplification,just call us. Incidentally, the Signal Corps liked thismethod so well that they included it in Notice #3to MIL-STD-462 date 9 Feb 71.62

TYPE 6512-106R FEED-THRU CAPACITORfor RFI/EMI test setupsAPPLICATIONThe Type 6512-106R Feed-Thru Capacitorwas especially designed for use in RFI/EMI testsetups as required by MIL-STD-461/462 and otherspecifications. In this application it provides a lowr.f. impedance across the power source so thatEMI currents produced by a test sample can beaccurately measured with current probes.The 10 F feed-thru capacitor can also be usedas a power line filter installed in the wall of ashielded enclosure or equipment cabinet. Thecapacitor provides adequate insertion losswithout suffering the power current saturationlimitation of conventional filters which employtoroidal inductors.DESCRIPTIONThe Type 6512-106R Feed-Thru Capacitor isa highly reliable and ruggedly constructed unitfor general use in screen rooms or other environments.The 3.375" square case with four huskymounting inserts lends itself to convenientinstallation with a minimum of effort. The1⁄4-28 UNF threaded feed-thru stud will easilyaccommodate power currents in excess of 100amperes without heating or voltage loss.The capacitance value is 10 F 10%. The Type6512-106R voltage rating is 600 volts d.c.,275 volts at 60 Hz, and 250 volts at 400 Hz. Lowdissipation factor, high temperature rating, highinsulation resistance, doubly rated dielectricstrength, and long life characterize this versatiledevice. To satisfy safety requirements, a bleederresistance is included in the Type 6512-106R Feed-Thru Capacitor which serves todischarge the capacitor when the applied voltageis removed.FEATURES■ High insulation resistance over widetemperature range.■ Excellent stability with long life.■ Built-in discharge resistor for safety.■ Designed for bulkhead or bench mounting.SPECIFICATIONSCapacitance: 10 microfarads.Tolerance: 10% at 25C.Voltage Rating: 600 volts d.c.275 volts r.m.s. at 60 Hz.250 volts r.m.s. at 400 Hz.Current Rating: Limited by the heat of the 1 ⁄4-28threaded terminal stud. Easily handles 100amperes of power current. Can be used for currentsin excess of 200 amperes intermittent duty.Temperature: Will operate at full rated voltagefrom -55C to 100C. To +125C with 50% voltagederating.Dissipation Factor: Less than 1% at 25C.Dielectric Strength: Will withstand the applicationof twice rated voltage at 25C for a period notto exceed two minutes.Insulation Resistance: At rated voltage or lessfor a period two minutes, the insulation resistancewill exceed 2500 megohms at 25C. However,insulation in excess of 500,000 ohms cannot bemeasured due to the bleeder resistor built intothe unit.Bleeder Resistance: An internal bleeder resistorof 500,000 ohms is included as specified in SAEdocument ARP-936.Life Test: Will withstand the application of 600volts at 85C for 250 hour.Construction: Extended foil coaxial windingprotected with a thin mylar film. Hermeticallysealed with ceramic to metal seals.63

TYPE 6512-106R FEED-THRU CAPACITORNEED HIGHER CURRENT OR HIGHER 400 HzVOLTAGE RATING?Type 7012-106R, 10 F, 500 V at 400 Hz, 200amperes. Size: 5" x 5" x 6" (127 mm x 127 mm x152 mm) with 3 ⁄8 -16 feed-thru stud.Type 7113-106R, 10 F, 500 V at 400 Hz, 500amperes. Size: 5" x 5" x 6" (127 mm x 127 mm x152 mm) with 1 ⁄2-20 feed-thru stud.Type 7314-106R, 10 F, 300 V at 400 Hz, 100amperes. See drawing.85.7 mm66.5 mm88.7 mm66.5 mm25.4 mm 70 mm 25.4 mm9.6 mmOUTLINE DRAWING FOR TYPE 6512-106R AND TYPE 7314-106RdB70605040SOLAR TYPE 6512-106RSAE MINIMUM REQUIREMENT ARP-93630201001K 10K 100KFREQUENCY 1MIN HERTZ 10M 100M 1GFREQUENCY IN HERTZINSERTION LOSS MEASURED IN 50 OHM CIRCUIT PER MIL-STD-220AINSERTION LOSS MEASURED IN 50 OHM CIRCUIT PER MIL-STD-220A64

WAVE FILTERS: LOW PASS, HIGH PASS,BANDPASS, BAND REJECTDB0–20–40–60–80–100–12040 100 1K 10K 100KFREQUENCY, HzTYPICAL INSERTION LOSSHIGH PASS FILTER, 50 OHM CIRCUITDESCRIPTIONAll kinds of wave filters are useful in audio, r.f. andEMI programs to isolate selected portions of thefrequency spectrum.Custom designed wave filters are readily availablein different impedance values and with differentresponse slopes outside the pass or reject bands.The slope of response outside of the passbanddepends on the number of poles (circuit elements).Butterworth style filters are usually preferredsince the ripple in the passband isnegligible. For Butterworth designs, the frequencyslope outside the passband is:7 pole, approximately 42 dB per frequency octave9 pole, approximately 54 dB per frequency octave11 pole, approximately 66 dB per frequency octaveWhen any kind of wave filter is ordered, thenumber of poles or the steepness of the skirts ofthe response curve must be specified. It is alsonecessary to specify the impedance of the circuitwhere the filter will be inserted.The cutoff frequency (fc) must be stipulated. Thisis the -3 dB point on the response curve whichestablishes the frequency limit of the pass orreject band. In Butterworth designs, the “knee” ofthe curve is rounded as it merges into the pass orreject band.Most of the filters listed on the other side ofthis page were designed using the Butterworthmethod due to the absence of ripple in the passband.TheChebycheff design is also available, andusually can be held to less than 1.0 dB ripple inthe passband. The Chebycheff design providesmuch steeper slopes. It is sometimes preferredwhen a sharper demarcation is needed betweenthe frequencies of the passband and the frequencieswhich lie outside the band and when someripple is tolerable. Fifteen poles is a practical limit.LOW PASS FILTERSLow pass filters are needed in test setups forMethods CS03, CS04, CS05, CS08 and RS04 ofMIL-STD-462. To eliminate spurious harmonicsand other frequencies above the range of interest,use Solar Electronics Low Pass Filters whichprovide more than 100 dB of insertion loss atthree times the cutoff frequency. Eleven reactivecomponents. Ripple in passband less than 0.5 dB.Use in 50 ohm circuits.HIGH PASS FILTERSWhen applied to a.c. powered equipment. TestMethods CE01 and CE03 of MIL-STD-462 requirethe elimination of the fundamental powerfrequency and the second, third and fourthharmonics. Notch filters have too much insertionloss in the passband and you need four of them. Ahigh pass filter is the only practical answer. Usedat the input to EMI meter, Solar Electronics HighPass Filters provide more than 100 dB insertionloss at the power line frequency and a very steepresponse.BANDPASS FILTERSBandpass filters are useful for selecting a midrangeportion of the frequency spectrum withrejection slopes above and below the selectedrange. The low frequency cutoff can be as low as10 Hz.The high frequency cutoff can be as high as50 MHz.BAND REJECT FILTERSThe inverse of bandpass filters, these unitsprovide rejection of frequencies between twoselected points in the spectrum. The slopingresponse between the low and high cutofffrequencies is as steep as the number of polespermits. For eleven pole filters, the slope isapproximately 66 dB per frequency octave.65

WAVE FILTERS (cont.)Bandpass and band reject filters use two reactiveelements for each pole. This makes them physicallylarger and more costly.For F.C.C., V.D.E., C.I.S.P.R., or the U.S. ArmyNOTICE 3 version of MIL-STD-462, where LISNsare used for conducted emission tests, a portionof the a.c. line voltage to the EUT is present at ther.f. jack of the LISN.To prevent damage to the EMI meter or spectrumanalyzer used used for these tests, it is recommendedthat a high pass filter be connectedbetween the LISN and the meter.HIGH PASS FILTERS FOR USE WITH LISNsFor 50 Hz power frequency, use 7205-0.30. For60 Hz power frequency, use 7205.0.35. For 400Hz power frequency, use 7801-2.4 or 7930.-2.4.For Army Notice 3, MIL-STD-462 or for F.C.C., use7801-8 or 7930.8.SIGNAL LINE LOW PASS FILTERS FORCS03, CS04, CS05, CS08 ANDRS04 OF MIL-STD-462 AND OTHER SPECS.Type No. -3 dB -100 dB Type No. -3 dB -100 dB6623-0.1 0.1 MHz 0.3 MHz 6623-5.0 5.0 MHz 15 MHz6623-0.2 0.2 MHz 0.6 MHz 6623-10 10.0 MHz 30 MHz6623-0.5 0.5 MHz 1.5 MHz 6623-20 20.0 MHz 60 MHz6623-1.0 1.0 MHz 3.0 MHz 6623-30 30.0 MHz 90 MHz6623-2.0 2.0 MHz 6.0 MHz 6623-50 50.0 MHz 150 MHzHIGH VOLTAGE 50 OHMHIGH PASS FILTER STYLES7801-( ) Rated at 125 V.A.C., Type N connectors7930-( ) Rated at 270 V.A.C., Type N connectors8130-( ) Rated at 270 V.A.C., Type BNC connectors8131-( ) Rated at 125 V.A.C., Type BNC connectorsThe cutoff frequency in KHz is appended as a dashnumber to the basic part number. For these four styles(only) the cutoff frequency must be greater than 2.3 KHz.Example: 7801-2.4.NOTES: When filters will be permanently installed, add dash FL to part number to specify amounting flange on each end of filter can.Connectors are Type N unless otherwise noted. Filters rated 50 V.A.C. unless otherwise noted.Type FILTERS, 50 OHM LOW PASS6623-( ) For signal lines. Dash number = fc = MHz, 11 pole Butterworth7836-( ) For signal lines. Dash number = fc = MHz, 11 pole Butterworth7907-( ) Isolated from case. Dash number = fc = MHz, Tri-ax connectors8016-( ) For signal lines. Dash number = fc = KHz, 15 pole Chebycheff, BNC8304-( ) Same as 7836-( ) except banana jacks each end8305-( ) 7 pole Butterworth. Dash number = fc = MHz, BNCFILTERS, 50 OHM HIGH PASS7205-( ) For signal lines. Dash number = fc = KHz, 11 pole Butterworth7720-( ) For signal lines. Dash number = fc = MHz, 11 pole Butterworth7801-( ) Rated: 125 V.A.C. Dash number = fc = KHz. (fc must be > 2.3 KHz)7930-( ) Rated: 270 V.A.C. Dash number = fc = KHz. (fc must be > 2.3 KHz)8018-( ) Same as 7720-( ) except with BNC connectors8130-( ) Same as 7930-( ) except with BNC connectors (fc must be > 2.3 KHz)8131-( ) Same as 7801-( ) except with BNC connectors (fc must be > 2.3 KHz)8209-( ) 15 pole Chebycheff. Dash number = fc = MHz. BNC connectors8310-( ) Same as 7205-( ) except with BNC connectorsH.P. and L.P. FILTERS WITH IMPEDANCES OTHER THAN 50 OHMS6824-( ) 600 ohm High Pass. Dash number = fc = KHz, 11 pole Butterworth7914-( ) 600 ohm Low Pass. Dash number = fc = KHz, 11 pole Butterworth8206-( ) 75 ohm Low Pass. Dash number = fc = KHz, 15 pole Chebycheff,male BNC on one end, female BNC on the other endBANDPASS FILTERS (BUTTERWORTH)7829-*/* 600 ohm Bandpass filter, 7 poles, BNC connectors7830-*/* 50 ohm Bandpass filter, 7 poles, BNC connectors7843-*/* 50 ohm Bandpass filter, 9 poles, BNC connectors7844-*/* 600 ohm Bandpass filter, 9 poles, BNC connectors7845-*/* 600 ohm Bandpass filter, 11 poles, BNC connectors8106-*/* 150 ohm Bandpass filter, 7 poles, BNC connectors8311-*/* 50 ohm Bandpass filter, 11 poles, BNC connectorsBAND REJECT FILTERS (BUTTERWORTH)8227-*/* 50 ohm Band Reject filter, 7 poles, BNC connectors8229-*/* 50 ohm Band Reject filter, 9 poles, BNC connectors8231-*/* 50 ohm Band Reject filter, 11 poles, BNC connectors*/* The dash number appended to the part number of Bandpass and Band Reject filters describes the-3dB points in Hertz. Example: -300/3K = -3 dB points at 300 Hertz and 3 Kilohertz. Dash number canbe as low as 10 Hz on the low end and as high as 50MHz on the high end.66

ACCESSORIES and MISCELLANY for the EMI LABNecessary . . . useful . . . practical items whichmake life in the screen room easier for the EMI engineer.When setting up a shielded room for fullcompliance with EMI specifications, it is oftendiscovered that there are incidental items whichare needed, but which have not been consideredin the overall planning. Some of these itemsare indicated on the catalog pages under thesubheading USEFUL ACCESSORIES.This page details other items which have a usefulpurpose in any well managed test facility.Type 6920-0.5 Resistive Network. This unitconsists of a 0.5 ohm resistor in a special housingdesigned to plug directly into the primaryterminals of the Type 6220-1A Audio IsolationTransformer. It is used to flatten the responsivecurve of the test method described in ApplicationNote 622001.The method uses the transformer asa pickup device, in lieu of a current probe, forfrequencies too low for conventional EMI currentprobes.Type 7032-3 Isolation Transformer. There aretimes when it is necessary to step up the powerline voltages from 115 volts to 230 volts or stepdown 230 volts to 115 volts. This transformer isequipped with a male connector on the 115 voltwinding and a female connector on the 230 voltwinding. The connectors are the internationalstyle IEC-320/CEE 22. Mating plugs not supplied.Rated at 800 watts, 50-60 Hz.Type 7144-1.0 Precision Resistor. A 50 watt,one ohm resistor used in Test Method RS01 tomeasure the current in the Type 7429-1 radiatingLoop Antenna.This device is mounted in a specialhousing with terminals for a voltmeter. Since theresistance value is one ohm plus or minus fivepercent, the voltage measured on these terminalsis equal to the current flowing in the circuit, up to100 KHz.Type 7144-10 Precision Resistor. A 50 watt, tenohm resistor used in Test Method RS02, Notice 3,U.S. Army version of MIL-STD-462 and TestMethod CS09, Notice 4, U.S. Navy version ofMIL-STD-462. This resistor can be used where'R' is designated in Figure CS09-1 with a voltmeterconnected across it to determine the requiredone ampere of current. Useful, because it cancover the required frequency range and can beused up to 300 KHz. Most EMI current probes aredeficient at the low end of the range.Type 7835-891 Coupling Network. A capacitivecoupler for line-to-line EMI voltage measurementsas required by Test Method CE07, Notice 3,U.S. Army version of MIL-STD-462. Equivalent toCU-891/URM-85. Rated at 500 V.D.C. Intendedfor use with 50 ohm EMI meter from 150 KHz to30 MHz.Type 7835-892 Coupling Network. A capacitivecoupler similar to 7835-891 except presents 500ohm to the circuit under test when used with a50 ohm EMI meter. Equivalent to CU-892/URM-85.Type 7835-896 Coupling Network. A capacitivecoupler similar to 7835-891 except used from20 MHz to 1 GHz. Equivalent to CU-896/URM-85.Type 8121-1 Adapter for Type 7021-1 PhaseShift Network. Plugs into the terminals ofthe network and provides heavy duty terminalscapable of carrying 200 amperes to theEquipment Under Test. Used when the EUT drawsin excess of 50 amperes.Type 8128-1 Adapter. Converts two single LISNs,Type 8028-50-TS-24-BNC, to a dual unit. Consistsof an insulated panel fitted with banana plugsto mate with the binding posts of two LISNs.67

ACCESSORIES AND MISCELLANY FOR THE EMI LAB (cont.)It provides connections to a parallel bladereceptacle with a U shaped grounding pin.The receptacle is identical to that used in the USAfor power connections. When the EquipmentUnder Test contains a standard power cord, thecord can be plugged into the receptacle.Type 9133-1 Three Phase Capacitor Assemblyfor Line-to-Line Capacitance in Delta-Connected Power Systems. This handy devicecontains three capacitors, ten microfarads each,connected to provide capacitance from phase Ato B, A to C, and B to C. The capacitors are rated at270 volts A.C. As a safety feature, each capacitoris paralleled with a 500K resistor to prevent avoltage charge from remaining on the assemblyafter power is disconnected. It is fitted with1/4-28feedthru studs to facilitate making connectionfrom three phase power to a three phase load upto 100 amperes. The Type 6512-106R capacitorcan be used for the neutral in wye-connectedpower systems.Dimensions: 3.5" x 6.0" x 3.75" high.(89 mm x 152 mm x 95 mm)Type 8814-1.5 Resistive Load. A 300 watt1.5 ohm load resistor designed to plug directlyinto the primary of the Type 6220-1A AudioIsolation Transformer when used with Type8850-1 Power Sweep Generator. Maximuminput voltage 21 volts. Although some audiopower is spent in the resistor, this device stabilizesthe impedance presented to the load in the CS-01test setup.Type 8814-2.4 Resistive Load. A 200 watt2.4 ohm load resistor designed to plug directlyinto the primary of the Type 6220-1A AudioIsolation Transformer when used with Type8850-1 Power Sweep Generator. Maximuminput voltage 22 volts. Some of the audio poweris used up in this resistor, but it will stabilize theimpedance presented to the load in CS-01 tests.Type 8806-1 Pulse Stretching Network. Whenused with Type 8282-1 Transient PulseGenerator and associated pulse transformer,Type 8406-1 will provide a 20 microsecond spikeup to 1,000 volts into a 50 ohm load.Type 8801-1.6 Inductor. An air core inductor,1.6 millihenries, for use with VDE specification0871 A1-April 1984, DIN 57871-A1. Capable ofcarrying ten amperes. Three way-binding posts.Dimensions: 2.88" x 3.8" x 2.12" high.(73 mm x 96 mm x 54 mm)68

Application InformationTYPE 7415-3 R.F. COUPLER AND HIGH PASS FILTERThere are those who disagree with the r.f.conducted susceptibility test setup of MethodCS02 of MIL-STD-462. Homemade rigs havesprouted to comply with the coupling capacitorrequirement, each with it own disadvantage.Our little Type 7415-3 R.F. Coupler is the answer.A neat little box with BNC connectors and a pairof binding posts, it is rated at 270 V.A.C. at the LINEterminals and 20 volts PMS into the GEN port.Looks good and does a fine job.The test setup diagram of the specification willresult in power frequency voltages at thevoltmeter terminals. If an untuned voltmeter isused, it is difficult to measure a one volt r.f. signalin the presence of the a.c. line voltage. It is notpractical to use an EMI meter for this, unless theType 7415-3 is placed in series with it. Otherwise,the power frequency voltage can damage theinput circuit of the EMI meter.The Type 7415-3 contains a high pass filter inseries with the detector circuit to eliminate powerfrequency voltages and allow r.f. signals from50 KHz to 400 MHz to pass to the EMI meter asrequired. The high pass filter consists of threestages of an R-C network using series capacitorsand shunt resistors. Using resistors insteadof inductors enables the unit to cover a widefrequency range, with a 40 dB insertion loss inthe pass band.This makes it necessary to multiplythe detected voltage by a factor of 100 for themeasurement of the injected voltage.The series capacitor in the Type 7415-3 consistsof several styles of capacitors in parallel. Mica,ceramic and wrapped capacitors exhibit differentcharacteristics versus frequency and thecombination eliminates the need to change thevalue of the capacitor as frequency changes from50 KHz to 400 MHz.A tuned voltmeter such as an EMI meter isrecommended as the detector for furtherisolation of unwanted frequencies, such asharmonics of the signal generator. If the generatorwaveform is “clean.” An untuned meter can beused if it is terminated in 50 ohms and preservesa 50 ohm coaxial circuit throughout thefrequency range.The reactance of the built-in series capacitor fromthe generator to the power line terminal presentsvery little loss at 50 KHz. At 400 Hz its reactance isabout 362 ohms.Therefore, it represents a path bywhich 400 Hz power voltages can be fed back todamage the output circuit of the signal generator.To avoid this, one suggestion is to use an isolatingtransformer at the output of a low impedancesignal source. Figure 1 shows the use of theModel 6552-1A Audio Amplifier and the Type7033-1 Impedance Matching Transformer. Thisarrangement can be used for injection levelsup to 20 volts r.m.s. from 50 KHz to 500 KHz withsatisfactory results.At frequencies above 500 KHz, we recommendthat a 50 ohm signal generator be used as indicatedin Figure 2 except that a small capacitormust be connected in series between thegenerator and the Type 7415-3 R.F. Coupler.Solar Type 7525-1 is 0.1 microfarad, fittedwith BNC connectors.The reactance of this series capacitor reduces thepower frequency voltage to a safe limit so thatthe output circuit of the generator will not bedamaged. At 500 KHz, the r.f. signal is not greatlyattenuated.At frequencies above 20 or 30 MHz, the connectionsfrom the banana jacks to the test sample willcreate discontinuities that cannot be removedfrom the setup. It is recommended that the wiresfrom the banana jacks be less than one inch longto minimize VSWR anomalies.DIMENSIONS2.0" (51 mm) X 2.5" (63.5 mm) plus mountingflanges x 1.25" (31.25 mm) high.TYPE 9132-1 R.F. COUPLER AND HIGHPASS FILTERThis unit is a high voltage version of the Type7415-3. It is electrically similar, but in a largercase and with a rating of 500 VAC at the LINEterminals and 20 volts rms into the GEN. Port.Dimensions: 2.88" (73 mm) x 3.06" (78 mm) plusmounting flanges x 2.0" (51 mm) high.TYPE 9407-1 A THREE PHASE R.F. COUPLINGNETWORKMIL-STD-462 notice 5, method CS02 requiressimultaneous coupling of the r.f. susceptibility69

TYPE 7415-3 R.F. COUPLER AND HIGH PASS FILTER (continued)signal into all three wires of a three phasepower system. The Type 9407-1 networkprovides this capability in a neat little box.The unit includes a high pass filter for theelimination of power frequency voltages.Rating of 270 VAC at the LINE terminals and 20volts rms into the GEN. Port.Dimensions: 2.88" (73 mm) x 3.06" (78 mm) plusmounting flanges x 2.0" (51 mm) high.Test Method CS02 requires injection of the signalfrom a 50 ohm generator capable of seven voltsoutput. This is equivalent to a one watt source.There are two conditions which could inhibitthe injection of one volt r.f. into the EquipmentUnder Test:1) If the r.f. impedance looking into the powerterminals of the Equipment Under Test isconsiderably lower than 50 ohms at theinjection frequency, the injected signal willbe shunted and it may not be possible toachieve the required injection voltage with aone watt source.2) If the connections to the power source areheavily by-passed as in the case of screenroom testing, this will also shunt the injectionvoltage so that the required level cannot bereached. This can be prevented by insertingan inductor in the power line asindicated in Figure 1 and Figure 2.The secondary of the Solar Type 6220-1ATransformer can be used as this inductor.Therefore, the test setup must becarefully monitored to keep the signal sourcefrom exceeding the required seven volts. If theEquipment Under Test does not malfunctionwith a seven volt signal from a 50 ohm source,it is deemed to have passed the test.Even though the signal input port ofthe Type 7415-3 is rated at 20 volts, it is notOR 9132-1OR 9132-1FIG. 1 TEST SETUP FOR FREQQUENCIES FROM 50 KHz - 500 KHzFIG. 2 TEST SETUP FOR FREQQUENCIES FROM 500 KHz - 400 MHzrecommended that the power of the signalsource be increased beyond one watt in aneffort to reach a one volt injection level.70

Application Information on High Voltage Spark TestsUSING TYPE 7115-1 OR 7115-2HIGH VOLTAGE TRANSIENT PULSE TRANSFORMER AND TYPE 7510-1 SPARK GAPThe Type 7115-1 Transient Pulse Transformer isdesigned to be plugged into the SERIES outputterminals of the Model 6254-5S TransientGenerator to step up the transient or “spike”voltage. The Type 7115-2 Transient PulseTransformer is designed to be plugged into theSERIES terminals of the Model 8282-1 SpikeGenerator. When specifications require a staticdischarge to the shield or case of the equipmentunder test, the Type 7510-1 Spark Gap canbe useful.The Pulse Transformers are in an insulated casemeasuring 3" x 3.8125" x 4" and fitted withbanana plugs on the primary for insertion in theoutput terminals of the transient generator.The 7510-1 Spark Gap is designed to bemounted directly on the output terminals of theType 7115-1 or 7115-2 transformer, or used at aremote point by means of interconnecting leads.The basic setup is shown on the back of this page.The Type 7510-1 Spark Gap is supplied withelectrodes which are pointed on one end andspherical on the other, so that either style maybe used by reversing the way they are mounted..A spacer block can be made to a given dimensionand used as a jig to position the points the correctdistance apart. The gap dimension should neverexceed 0.5" since the spark will then tend to jumpacross the structure of the Type 7510-1 insteadof the gap.Using the amplitude adjustment on the spikegenerator, the output of the Type 7115-1 or7115-2 can be raised from about 500 volts to15 kilovolts peaks. The shape of the transientis essentially the same as that produced bythe generator unless the voltage breaks downthe gap between the output terminals ofthe transformer (or gap in wiring connectedto the terminals). The output terminals areceramic insulated with metal parts separatedby at least 0.5".The transient pulse or resultant spark across acircuit is adjustable from 0.5 to 500 p.p.s. using therepetition rate controls on the spike generator.Since the output of the transformer is a very highimpedance, any capacitance across it will reducethe available output voltage. Ideally, keep theinterconnecting leads less than 6". The wire fromthe transformer to the spark gap should bespaced away from any wire or structure whichacts as a ground plane. The spark gap can beeither mounted directly to the case of theequipment under test or connected with a veryshort wire.The applied spark voltage can be adjusted byproperly spacing the spark gap distance. WItha spark gap in dry air at sea level and roomtemperature, the approximate voltage required tobreak down the gap is:Peak 7510-1 7510-1Voltage Needle Gap Spherical Gap5 KV 0.15" (3.8 mm) 0.049" (1.24 mm)10 KV 0.33" (8.4 mm) 0.10" (2.54 mm)15 KV 0.60"(15.2 mm) 0.17" (4.32 mm)71

APPLICATION INFORMATION ON HIGH VOLTAGE SPARK TESTS (continued)After the gap distance has been adjusted. set thecontrols of the spike generator to 1 p.p.s. andminimum amplitude. Turn on the generator andslowly increase the amplitude until a consistentspark jumps the gap once every second.Increasing beyond this level will not increasethe voltage since the breakdown of the gaplimits the voltage. At faster repetition rates itis possible to reduce the amplitude after a fewseconds since the air in the gap ionizesand breaks down at a lower voltage. It isrecommended that the test be performed atlow repetition rates or with the pushbuttonfor manually applied single discharges.SOLAR 8282-1,7054-1 OR 6254-5STRANSIENTGENERATOR72

Application InformationTYPE 7021-1 PHASE SHIFT NETWORKThe Type 7021-1 Phase Shift Network phasesout the power frequency without disturbingthe injected frequency seen by the VTVM,analog voltmeter, or scope in Method CS01of MIL-STD-462. The network prevents thepower frequency from reaching the indicatingdevice, but doesn’t interfere with the normalpower connection to the test sample. Properlyadjusted, it has no effect on the injectedfrequency, so the voltmeter or scope will indicatethe injected level. Contains variable resistanceand capacitance in a bridge-type circuit whichis manually adjusted for null before the injectedsignal is applied. Does a fine job on 50 Hz, 60 Hz,and 400 Hz power lines. Either 115 volt or 230 voltoperation.The various terminals on the Type 7021-1 areinterconnected internally as shown by the heavylines drawn on the panel. These connections arecapable of carrying up to 50 amperes of powercurrent. For power currents up to 200 amperes,the Type 8121-1 Adapter can be plugged intothe terminals of the Type 7021-1 unit. Theadapter provides .375” threaded studs for carryingthe larger power current to the test sample.(The adapter must be ordered separately.) Safetyprecautions must be observed since all powerterminals are exposed.The operation of the Phase Shift Network is relativelysimple. With the audio source connected,but its level reduced to minimum, adjust the resistanceelements (the two upper knobs on theType 7021-1), and the capacitive elements (thestep switches) for a null or minimum indication onthe scope and voltmeter.VTVMORANALOGVOLTMETERThere is some interaction of these controlsand when one is adjusted, the other shouldbe readjusted and this action repeated severaltimes. With careful attention to this, it shouldbe possible to reduce the levels to below300 millivolts on the voltmeter. Then, the audiosource can be increased until the voltmeterindicates the voltage required by the susceptibilityspecification.TEST SETUP FOR AUDIO SUSCEPTIBILITY TEST ON A.C. LINESSOLAR6550-1 OR8850-1 POWERSWEEPGENERATORIn the test setup shown above, the purposeof the power line isolation transformer,Type 7032-1, is to eliminate the power groundor chassis earth connection of the voltmeterand the oscilloscope. The chassis of these unitsfloats on the power leads and must be isolated toprevent short circuits. Operating personnelshould avoid touching the case or chassis atthe same time they are in contact with earthconnected items.73

Application InformationTYPE 6693-3L/3R RF-DC ISOLATOR NETWORKFOR INSERTION LOSS TEST OF EMI FILTERS WITH D.C. CURRENT FLOWING THROUGH THE FILTERThe Type 6693-3L/3R RF-DC Isolator Networkconsists of two units used as “buffer” networks inperforming insertion loss tests on EMI filters whilepower current is flowing through the filter. Thenetworks provide a high impedance in series withthe power source so that r.f. signals will not bedeteriorated by the low impedance of the powersource.MIL-STD-220A requires insertion loss measurementsusing this method up to 20 MHz. TheType 6693-3L/3R Isolator Networks are usableat frequencies from 150 KHz to several hundredmegahertz. The loss isn’t bad up to 500 MHz.Standing waves give it some irregularity from500 MHz to 1,000 MHz. This is measured in a50 ohm circuit as required by MIL-STD-220A.The wide range of frequencies is made possibleby a special coil design and a transmissionline connection from r.f. input to output.Unfortunately, the coil design does not lend itselfto large amounts of power current.These units arerated at 15 amperes d.c. maximum.Two styles are used in the test setup as shown inthe diagram on this page. The two units, 6693-3Land 6693-3R, are identical except that one isphysically the mirror image of the other forconvenience in making the test setup. Althoughthe jack on one side of one is marked SIGNALGENERATOR and the jack on the opposite side ofthe other unit is marked R.F. VOLTMETER, thesetwo connections can be interchanged if it makesyour setup easier to use.The shielded cable connection between theconnector marked TO FILTER UNDER TEST and thefilter is a matter which must be arranged to fit theparticular terminal or connector on the filter.There are many different configurations and no“standard” is possible. Ideally, the shield shouldterminate in a metallic fitting which completelyshrouds the filter terminal, to avoid inadvertentcoupling at the higher frequencies.75

Application InformationCABLE INDUCED TRANSIENTSFOR SPACE SHUTTLE PROGRAMThe design requirements for electrical equipmenton board the Space Shuttle vehicle include cableinduced currents, called “indirect lightningeffects” as described in Rockwell InternationalSpecification MF0004-002. A system for providing“component number one” described in Figure15(b) of that specification has been developedand includes three items as follows:Type No.Description7512-1 Spike Injection Probe7519-1 Pulse Shaping Network (foruse with Model 6254-5S,Model 7054-1 or Model 8282-1Spike Generator)7541-1 Spike Receptor Probe(calibrated for use withoscilloscope)The test method described in paragraph 4.2.7.2and Figure 16 of the specification requires twoprobes which are torodial transformers usingthe cable under test as the coupling betweenthem.The injection probe and the receptor probeare different in character and cannot be usedinterchangeably.When using the Model 6254-5Sor 7054-1 or the 8282-1 (in 10 S mode) SpikeGenerator as the signal source, it is necessary tomodify the shape of the pulse to comply with thewaveform shown in Figure 15(b). The 7519-1Pulse Shaping Network is used betweenthe spike generator and the injection probe toprovide the appropriate waveform. The blockdiagram on the back of this page depicts thearrangement. A brief description of the threeancillary items follows:Type 7512-1 Spike Injection Probe — Since itis possible to pass the test cable through thewindow of the injection probe, it is not a splitconstruction, but it is a complete toroid fittedwith a BNC connector. The core used in thisprobe has been specially selected to adequatelytransmit the low and high frequency componentsof the required spike waveform. The insidediameter of the injection probe is 1.25", suitablefor most cable diameters. Because it is necessaryto feed the cable through the window of theprobe, the connector on the cable must beless than 1.25" diameter or the connector mustbe removed before inserting the cable throughthe probe.Type 7519-1 Pulse Shaping Network — Thewaveform of Model 6254-5S, Model 7054-1 andModel 8282-1 (in 10 S mode) Spike Generatorsdecays to zero in approximately 10 microseconds.Since the waveform of Figure 15(b) for componentnumber one is longer, the basic waveform isstretched by the 7519-1 network at the expenseof rise time and amplitude. However, the generatorshave sufficient range in peak amplitude toovercome the loss and the slightly lengthenedrise time is still within the requirements. Theshaping network and the injection probe haveeach been designed so that short circuit currentof 10 amperes flows through the cable under test.This is achieved at a generator setting whichdelivers 50 volts when the cable under testis open circuited at the receptor end.Type 7541-1 Spike Receptor Probe — Thereceptor probe is assembled with a hingedconstruction allowing it to be placed aroundthe cable under test. The design of this probeincludes a calibrating resistor mounted inthe housing. This resistor has been adjusted sothat the display on the associated oscilloscopeaccurately indicates the value of spike currentdetected. The vertical amplitude in volts/cmis converted to amperes/cm by multiplyingthe displayed peak value by a factor of ten.The waveshape displayed on the oscilloscopeshould be similar to the requirement specifiedin Figure 15(b) of specification MF0004-002,decaying to zero in approximately 100 to 120 S.77

APPLICATION INFORMATION ON CABLE INDUCED TRANSIENTS (continued)78

THE ENGINEER’S CLOCKWe don’t mean to imply that engineers are clock watchers, but . . .this clock has a face you’ll never stop watching!INSTANT CONVERSION:Two large scales display the relation ofdecibels to 20 times the log (base 10) ofany number from 1 to 1,000.GRAPHIC:Dispels the illusion that twice as manydecibels means twice as much of anyquantity.EDUCATIONAL:Explain to the boss that you are notclock-watching, but diligently memorizingdecibel equivalents to voltage andcurrent ratios.VERSATILE:Most engineers can even tell time withthis clock.ICE-BREAKER:Even with this large diameter clock,people will ask,“Do you have the time?”COMPATIBILITY:Guaranteed to be EMI-free.DIMENSIONS:This clock face is large enough to beseen and analyzed even when mountedon the far wall of the lab or the screenroom.79

EMI PREDICTION GRAPHfor rectangular and trapezoidal pulse interference100 ms10 ms1 ms100 s10 s1 s100 ns10 ns1 ns100 psPULSEDURATIONEMI PREDICTION EMI PREDICTION GRAPH GRAPH FOR FOR RECTANGULAR RECTANGULAR AND AND TRAPEZOIDAL PULSE PULSE INTERFERENCEFREQUENCY, PULSES PER SECOND1 10 100* For EMI current predictions, substitute“ampere” for “volt” and “microampere”for “microvolt.” Right-hand scale becomes“Decibels above one microampere permegahertz.”1KDECIBELSABOVE ONE MICROVOLTPER MEGAHERTZ*10K 100K 1M 10M 100M 1G 10GTIMERISEREFERENCE LINE100 ms10 ms1 ms100 s10 s1 s100 ns10 ns24023022021020019018017016015014013012011010090807060504030201001 nsFOURIERPREDICTION OFEMI ENVELOPEGiven rise time, durationand amplitude of basicpulse, determine theenvelope of EMI voltagesmeasured at EMI meterinput as follows:Work from right to left.Find the sloping line whichrepresents rise time andfollow it up to intersectwith the basic referenceline. Follow the referenceline up to intersect withthe horizontal line representingthe duration ofthe pulse. Follow thehorizontal line to the leftto the lowest frequency ofinterest.For transient or “worstcase” when pulse informationis not available, usethe basic reference line todefine the EMI envelope.For EMI voltage* levels,read the right edge fordecibels above one microvoltper megahertz bandwidth.For voltages other thanone volt*, find the numberof dB equivalent to 20times the log of the newvoltage. Add this numberof dB to the right handscale.81