Model SR715 Model SR720 LCR Meters

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CALIBRATION3. Standard Resistor CalibrationThis procedure determines the value of the internal standards for the different frequencies and ranges.The <strong>SR715</strong>/720 does this by measuring a precisely known resistor and recomputing the values it useswhen calculating the impedance of a part. These values are the primary accuracy standard of theinstrument, so the exact value of the calibration resistor, both real and imaginary parts, must be known. Inaddition, the <strong>SR715</strong>/720 and the calibration resistors must be placed in a temperature controlled room andallowed to stabilize at least 30 minutes before attempting to calibrate.The standard cal menu is entered as follows. Press the [Calibrate] key until "Std cAL" appears on thedisplay. Press [ENTER] once to get into this menu structure. Next press [Calibrate] until the "rAngE"message appears on the left display. From here the desired range can be entered (using the [0]-[3] keysand [ENTER]) and will appear on the right display. After the range has been entered, pressing [Calibrate]will cycle through a series of menus. Pressing [ENTER] in any of these will either load that value or beginthe action listed. Two different parameters must be set, "r Std" (standard resistor resistance value) and"q Std" (Q of the standard resistor). Resistance values are entered using the [Ω], [kΩ] and [MΩ] keys andQ is entered in ppm's. Negative Q's denote capacitive resistors and positive Q's denote inductive ones.The different actions are "StArt cAL" (start cal), "Fctry cAL" (factory cal) and "quit cAL" (quit cal). Theseactivities will, in order, begin calibration of the current range, recall the factory default values, or exit thecal menu.1) Inspect the fixture contacts for dirt or waxy build up. If the fixture appears dirty, clean it as described inthe maintenance section. Remove any adapters or components from the fixture.2) Using the precision open and short circuit from the calibration kit, perform open and short circuit. Seethe operation section for details on this.3) Plug the R0 Calibration Resistor into the fixture. Enter the cal menu as described above and enterrange 0. Press [Calibrate] until "r Std" (resistance standard) is displayed. Enter the resistance of R0.Press [Calibrate] to display "q Std" (Q standard) and enter the Q of the standard in ppm. Press[Calibrate] to display "StArt cAL" (start cal). Begin the calibration by pressing [ENTER] making sure tokeep hands and any other objects away from the fixture.4) Repeat step 3 for the other three ranges (1, 2 and 3). When finished, exit the cal menu by pressing[Calibrate] until "quit cAL" is displayed and then pressing [ENTER].5) After calibration, verify that the calibration is accurate. Peform open and short circuit calibration. Insertthe standards in the fixture and measure them at 1 kHz, series equivalent circuit. The R and Qreadings should agree to within one least significant digit of the standard values.6) Check the standards at different frequencies. Use series for the two smaller resistors and parallel forthe two larger ones. R should remain relatively constant and Q should scale with frequency (i.e. Q at10 kHz is 10x Q at 1 kHz). If any of the values are too far from the nominal values, recalibrate thatrange.7) Before making measurements, run open and short circuit calibration with the fixture configuration tobe used.5-14
TROUBLESHOOTINGNothing Happens At Turn On Make sure that the power entry module on the rear panel is set for the ac linevoltage for your region, that the correct fuse is installed, and that the line cordis inserted all the way into the power entry module. The selected line voltagemay be seen through the clear window, just below the fuse.When the unit is plugged in and turned "ON", the unit's firmware versionnumber and serial number will be briefly displayed. Then the self tests shouldexecute.ResetInternal FuseExternal Bias FuseIf the unit displays no sensible message, the "cold boot" procedure may fixthe problem. To reset the instrument, turn the unit off. Then, while holding thebackspace key ([
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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
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SR715/720 LCR METERHow the SR715/72
Page 14 and 15:
SR715/720 LCR METERSENA(?) {i} Set
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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,
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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 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
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Model SR715 Model SR720 LCR Meters

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