Model SR715 Model SR720 LCR Meters

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OPERATIONSERIES and PARALLEL EQUIVALENT CIRCUITSAny non-ideal component can be represented as a resistive component either in series or in parallel with areactive component. Depending upon the characteristics of the component and the measurement frequency,either the series or parallel model will be the more accurate model. The more ideal a component is, the lessthe two models differ. However, as Q for inductors decreases towards 10 and Q for resistors or D forcapacitors increases towards 0.1, the series and parallel values begin to diverge. In general, most parts arebest approximated by the series model. Manufacturers often specify which representation should be usedwhen testing their devices. MIL or industry standards also specify test conditions.The [Equiv Circuit] key toggles between the two equivalent circuit models. The SERIES or PARALLEL LEDsindicate which model is active. For the series model, the left display shows the series resistance, inductance,or capacitance (for R+Q, L+Q, C+D and C+R). The right display will show the quality factor Q, the dissipationfactor D, or the series resistance. For the parallel model, the left display shows the parallel equivalents of themajor parameters (R, L, or C) and the right display shows Q, D, or the parallel resistance. Q and D are thesame for both the parallel and series models.DISPLAY TYPESThe [Display] key cycles through the five different display types. To cycle between the different displays, pressthe [Display] key repeatedly until the appropriate indicator LED is on. Some of the display types are notenabled unless the instrument is set appropriately. For example, only the Value and Entry displays areenabled when the instrument is in the AUTO mode.VALUEDEVThe value display shows the value of the component being measured. The typeof component is indicated by the LEDs above the display (R+Q, L+Q, C+D, C+R).The units of each display are indicated by the unit LEDs to the right of the eachdisplay. The AUTO LED indicates that the auto select parameter (AUTO) mode isactive. The Value display is enabled under all conditions.The DEV, or deviation display, shows the difference between the componentbeing measured and a previously entered relative value (display =measured value - relative value). This is useful for measuring small variations incomponent values. The DEV display is disabled if the unit is in AUTO mode or ifno nominal value has been entered. To use the DEV display, first enter a nominalvalue (see below), then press the display key until the DEV LED is on. Negativereadings mean that the measured value is smaller than the nominal value.Positive readings mean the measured value is larger than the nominal value.Entering a Nominal ValueTo enter a nominal value, press the [Display] key until the ENTRY display isselected. Next, press the appropriate parameter key, [R+Q] for nominalresistance values, [L+Q] for nominal inductance values, and either [C+D] or [C+R]for nominal capacitance values. The appropriate parameter LEDs will turn on andthe present nominal value (or the default value) will appear in the left display. Theright display will be blank. Enter the new nominal value using the numeric keysand one of the three enter keys [Ω,µH,pF], [kΩ,mH,nF], or [MΩ,H,µF].%DEVThe %DEV, or percent deviation display, shows the % difference between thecomponent being measured and a previously entered nominal value (display =100 x {measured value - nominal value} / nominal value). Percentages aredisplayed to 0.1%. As with the DEV display this display is disabled if the unit is inAUTO mode or if no nominal value has been previously entered. To enter anominal value, follow the proce dure described above.2-2
OPERATIONENTRYBINSAVERAGEThe ENTRY display allows entry of nominal values, measurement conditions, andcalibration data. To view this display, press the [Display] key until the ENTRY LEDis on. If an out of range or incorrect value is entered, the unit will beep and display'rAnGE Error' (range error) and not accept the value. The ENTRY display isenabled under all conditions.The BINS display shows the bin number that a component falls into when binningis enabled. The display is disabled unless binning information has already beenentered. The BINS display is also disabled when the unit is in the AUTO mode.To view the BINS display, first enter binning information and then press the[Display] key until the BINS LED is on. See the section on binning for moreinformationThe AVERAGE display shows the arithmetic average of two to tenmeasurements. Averaging improves accuracy by cancelling out random errorsand noise. This is useful for measurements at the extreme end of a measurementrange or with low output signal levels. The number of measurements to beaveraged is set in the ENTRY display. From the ENTRY display, press the[Average] key. The unit will display AvG in the left display and the present numberof averages in the right display. Set the desired number of averages (2 thru 10)and press the [ENTER] ([MΩ,H,µF]) key. Return to the desired display type usingthe [Display] key. Pressing the [Average] key toggles between averaging enabledand disabled. The AVERAGE LED indicates that averaging is enabled.AVERAGE works for all display types, including binning. In the BINS display, thebin number displayed is the bin number of an average of several measurements,NOT the average bin number.STATUSThese LEDs indicate the computer interface status. REM (remote) indicates that the unit is under remoteinterface control (front panel inactive). ACT (activity) indicates the computer interface is active. ERR (error)indicates that a command sent to the instrument contained an error.BINNINGThe NOM, +LIM and -LIM LEDs indicate which parameter is being entered while configuring the <strong>SR715</strong>/720for binning. See the section on binning for more details.2-3
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 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 82 and 83:
CALIBRATIONINTRODUCTIONCalibration
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#
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Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106:
SR715/720 PARTS LISTMiscellaneous a
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Model SR715 Model SR720 LCR Meters

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