Model SR715 Model SR720 LCR Meters

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SR715/720 LCR METEROPTIONSGPIB / Handler InterfaceSR726 Kelvin ClipsSR727 SMD TweezersOption 01 provides both an IEEE-488 interface and a Handler interface.IEEE-488 Interface: All instrument functions can be controlled or readover the interface.Handler/Sorter Interface: DB25 male connector provides output linesto indicate binning information andinstrument status and an input trigger line.Output lines include 8 Pass Bins, QDR FailBin, General Fail Bin, Busy, and Bin DataAvailable. Output lines are Open Collectorand are rated to 40 volts. The trigger input isnegative edge triggered TTL and isprotected to +/- 15 Volts.Provides connection to devices that are not easily accommodated in thefixture. Polarity is indicated for biased measurements. Connects toSR715/720 fixture.Provides connection to Surface Mount Device parts. Polarity is indicated forbiased measurements. Connects to SR715/720 fixture.SR728 BNC Fixture Adapter Provides a means to connect a remote fixture or other device to theSR715/720. Connects to SR715/720 fixture and has four 1 meter BNCcables. Polarity is indicated for biased measurements.vii
SR715/720 LCR METERBASIC OPERATIONThis section is designed to help the user beginmaking measurements with the SR715/720 LCRmeter and to familiarize them with some of itsfeatures. For more information on the differentfeatures, see the operations section.To operate the SR715/720, first verify that thecorrect line voltage has been selected on thepower entry module on the rear panel (See page1-3). Verify that no parts are in the fixture; theunit's self test routines will fail if any componentsare in the test fixture. After connecting the line cordto the power entry module, switch on the powerswitch, located on the rear right hand side of theunit. The unit will display the ROM version on theleft display and the serial number on the rightdisplay for about 3 seconds. Next, the unit willbegin its self test procedure. If all tests are OK,'tESt PASS' will be displayed. See theTroubleshooting section if the self test fails. Press[Recall] [0] [ENTER], to recall the default setup.This will set the unit as follows:ParameterFrequencyDrive VoltageBiasMeasurement RateAveragingRange HoldEquivalent CircuitDisplayTrigger ModeBinningAUTO1 kHz1.0 VrmsOFFSLOWOFFOFFSERIESVALUECONTOFFAt this point a part can be placed in the fixture andmeasurements can be made. The unit willautomatically decide which type of component is inthe fixture (R, C or L), change to the correct range,and display the part value with the correct units. Ifany of the test conditions need to be changed for ameasurement, press the appropriate keys. Mostfunctions are easy to change, but if moreinformation is needed, see the operating section.The SR715/720 comes with a built in fixture formeasuring radial leaded components, like mostcapacitors, and adapters for measuring axialleaded components, like most resistors. Tomeasure a radial leaded component, remove anyadapters and put one lead of the component ineach side of the fixture. To measure an axialleaded component, first install the fixture adapters.Put the adapters on in the middle of each side ofthe fixture, and then slide them until they areseparated by the appropriate distance. Insert theone lead of the component into each side of thefixture.After changing the fixture configuration, it is a goodidea to perform an open and short circuitcalibration. See the operation section forinstructions. If the component leads areexcessively dirty or are coated with wax, cleanthem before inserting them in the fixture. Thefixture contacts will usually make contact throughcoatings, but can eventually get gummed up.If biased measurements are being made oncapacitors, be certain that the part is installedwith the correct polarity, as marked on the unit.What is a passive device?All non-ideal passive devices (resistors, inductorsand capacitors) can be modeled as a realcomponent (resistor) either in series or in parallelwith a reactive component (capacitance orinductance). The impedance of these componentschange as a function of frequency. The series andparallel models are mathematically equivalent andcan be transformed back and forth with theequations shown below.Usually one model is a better representation of thedevice under operating conditions. The mostaccurate model depends on the device and theoperating frequency. Certain devices are testedunder conditions defined by the manufacturer orindustry standard. For example, electrolyticcapacitors are often measured in series at 120 Hzin the C+R mode, so the ESR (equivalent seriesresistance) can be measured.viii
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 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
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REMOTE PROGRAMMING8 Instrumentation
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REMOTE PROGRAMMINGSTANDARD EVENT bi
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REMOTE PROGRAMMINGexit (0);}ibwrt (
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REMOTE PROGRAMMINGTxGpib (sr720,"OU
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REMOTE PROGRAMMINGEXAMPLE PROGRAM 3
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REMOTE PROGRAMMING}printf ("bin 0 1
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REMOTE PROGRAMMINGEXAMPLE PROGRAM 4
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PERFORMANCE TESTS2. Self TestsThe i
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PERFORMANCE TESTSPERFORMANCE TESTST
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PERFORMANCE TESTSResistance Accurac
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PERFORMANCE TESTSSR715/720 PERFORMA
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CALIBRATIONINTRODUCTIONCalibration
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CALIBRATIONNecessary EquipmentInstr
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CALIBRATION3. Standard Resistor Cal
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TROUBLESHOOTINGError MessagesThe fo
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TROUBLESHOOTINGCalibration ErrorsTh
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MAINTENANCEAfter the fixture bracke
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MAINTENANCE6-8
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SR715/720 PARTS LISTREF. SRS PART#
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SR715/720 PARTS LISTMiscellaneous a
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