Model SR715 Model SR720 LCR Meters

More documents

Recommendations

Info

CALIBRATIONINTRODUCTIONCalibration of the SR715/720 is composed of several parts: open and short circuit calibration, standard resistorcalibration, and amplitude calibration. The open and short circuit calibrations are offset corrections to correctfor any stray impedances of the test fixture. These calibrations may be performed at any time and should bedone whenever the fixture is changed. The standard resistor calibration sets the accuracy of the SR715/720since it allows the LCR meter to determine the values of its internal standard resistors. Standard resistorcalibration need only be performed periodically to account for component aging and drift. Amplitude calibrationsets the amplitude of the ac test signal, and only needs to be done periodically. The amplitude calibration doesnot affect the SR715/720's accuracy.Calibration EnableCalbytesThe SR715/720 is shipped with standard resistor and amplitude calibrationdisabled. When calibration is disabled only the open and short circuit calibrationsare allowed. The internal calibration enable jumper must be set to enableamplitude and resistor calibration. To set the jumper, remove the SR715/720'stop cover by removing its four retaining screws (this will break the calibrationseal). In the rear center of the circuit board is a three pin jumper labelled JP1001.Use the jumper to connect the center pin and the "cal" pin to enable calibration.Connecting the center pin and the "normal" pin will disable calibration.The SR715/720's calibration is controlled by calibration constants ("calbytes") thatthe firmware uses to adjust the impedance calculations. These calbytes arestored in the SR715/720's RAM. Recalibration of the SR715/720 involvesdetermining the values of the calbytes and storing the new values in RAM. Thecalbyte values determined at the time of the SR715/720's manufacture are alsostored in ROM and may be recalled at any time. The standard resistor calbytesare automatically determined by the standard resistor calibration subroutines. Theamplitude calbytes must be manually determined.A list of the SR715/720's calbytes is shown on the following page. The open andshort circuit, and resistor calibration calbyte values are automatically determinedby the SR715/720's calibration subroutines. These calbytes cannot be directlychanged from the front panel (they may be changed via the computer interfaces).The amplitude calbytes are directly adjustable from the front panel.For the SR715 only: The values for the 100 kHz calbytes are set to zero and donot need to be adjusted.5-10
CALIBRATIONAmplitude Calbytes Amplitude Calbyte Numbers 0 thru 94Range 0 - 255 (1 byte)Amplitude Calbyte OrganizationFrequencyAmplitude 100 Hz 120 Hz 1 kHz 10 kHz 100 kHz0.10V 0 1 2 3 40.15V 5 6 7 8 90.20V 10 11 12 13 140.25V 15 16 17 18 190.30V 20 21 22 23 240.35V 25 26 27 28 290.40V 30 31 32 33 340.45V 35 36 37 38 390.50V 40 41 42 43 440.55V 45 46 47 48 490.60V 50 51 52 53 540.65V 55 56 57 58 590.70V 60 61 62 63 640.75V 65 66 67 68 690.80V 70 71 72 73 740.85V 75 76 77 78 790.90V 80 81 82 83 840.95V 85 86 87 88 891.00V 90 91 92 93 94Floating Point Floating Point Calbyte Numbers 0 thru 120CalbytesNumber Name Meaning0 Frequency Correction deviation from nominal, in ppm1-40 Reference Resistor Values impedance values organized inreal & imaginary pairs41-80 Open Circuit Values admittance values organizedas real & imaginary pairs81-120 Short Circuit Values impedance values organized inreal & imaginary pairs5-11
Page 1 and 2:
User’s ManualModel SR715Model SR7
Page 3:
TABLE OF CONTENTSOutput Voltage 5-2
Page 6 and 7:
SR715/720 LCR METERGENERAL INFORMAT
Page 8 and 9:
SR715/720 LCR METEROPTIONSGPIB / Ha
Page 10 and 11:
SR715/720 LCR METERSeries and Paral
Page 12 and 13:
SR715/720 LCR METERHow the SR715/72
Page 14 and 15:
SR715/720 LCR METERSENA(?) {i} Set
Page 16 and 17:
DISPLAYGETTING STARTEDThe LED displ
Page 18 and 19:
GETTING STARTEDmode. The range can
Page 20 and 21:
GETTING STARTEDREAR PANELPOWER ENTR
Page 22 and 23:
OPERATIONSERIES and PARALLEL EQUIVA
Page 24 and 25:
OPERATIONTEST CONDITIONSDEFAULT CON
Page 26 and 27:
OPERATIONcapacitors (test voltage =
Page 28 and 29:
OPERATIONRange Change Points When A
Page 30 and 31:
OPERATIONwhere T s = settling time,
Page 32 and 33: OPERATIONCONNECTING A DEVICEThe SR7
Page 34 and 35: OPERATIONKELVIN CLIPSKelvin Clips p
Page 36 and 37: OPERATIONOPEN and SHORT CIRCUIT OR
Page 38 and 39: BINNINGOPERATIONThe SR715/720 has b
Page 40 and 41: OPERATIONVALUES FORFAIL BINS (8 & 9
Page 42 and 43: OPERATIONOption 01: GPIB/Handler In
Page 44 and 45: ACCURACYDETAILED ACCURACY SPECIFICA
Page 46 and 47: 3-3ACCURACY
Page 48 and 49: ACCURACYL + Q ACCURACYAccuracy of L
Page 50 and 51: ACCURACYC + R ACCURACYAccuracy of C
Page 52 and 53: REMOTE PROGRAMMINGINTRODUCTIONThe S
Page 54 and 55: REMOTE PROGRAMMINGDETAILED COMMAND
Page 56 and 57: REMOTE PROGRAMMINGByte Character Me
Page 58 and 59: REMOTE PROGRAMMINGSR715/720 will us
Page 60 and 61: REMOTE PROGRAMMING8 Instrumentation
Page 62 and 63: REMOTE PROGRAMMINGSTANDARD EVENT bi
Page 64 and 65: REMOTE PROGRAMMINGexit (0);}ibwrt (
Page 66 and 67: REMOTE PROGRAMMINGTxGpib (sr720,"OU
Page 68 and 69: REMOTE PROGRAMMINGEXAMPLE PROGRAM 3
Page 70 and 71: REMOTE PROGRAMMING}printf ("bin 0 1
Page 72 and 73: REMOTE PROGRAMMINGEXAMPLE PROGRAM 4
Page 74 and 75: PERFORMANCE TESTS2. Self TestsThe i
Page 76 and 77: PERFORMANCE TESTSPERFORMANCE TESTST
Page 78 and 79: PERFORMANCE TESTSResistance Accurac
Page 80 and 81: PERFORMANCE TESTSSR715/720 PERFORMA
Page 84 and 85: CALIBRATIONNecessary EquipmentInstr
Page 86 and 87: CALIBRATION3. Standard Resistor Cal
Page 88 and 89: TROUBLESHOOTINGError MessagesThe fo
Page 90 and 91: TROUBLESHOOTINGCalibration ErrorsTh
Page 92 and 93: MAINTENANCEAfter the fixture bracke
Page 94 and 95: MAINTENANCE6-8
Page 96 and 97: SR715/720 PARTS LISTREF. SRS PART#
Page 106: SR715/720 PARTS LISTMiscellaneous a
show all

Model SR715 Model SR720 LCR Meters

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?