Keithley 2701, Service Manual

Page: 61 / 168

Model 2701 Service Manual Calibration 2-15
NOTE
Ensure the calibrator has settled to the final value. You can do so by verifying that
the “Settled” indicator is off or by using the *OPC? (operation complete) query.
Resistance calibration
Follow these steps for resistance calibration:
1. Set the calibrator to the resistance mode and turn on external sensing.
NOTE Use external sense (4-wire
Ω
) when calibrating all resistance ranges. Be sure that
the calibrator external sense mode is turned on.
2. Perform the calibration steps summarized in Table 2-9 . For each step:
• Set the calibrator to the indicated resistance and make sure the unit is in operate.
(Use the recommended resistance or the closest available value.)
• Send the indicated programming command. (Change the command parameter if
you are using a different calibration resistance than that shown.)
• Wait until the Model 2701 completes each step before continuing.
Table 2-8
DC voltage calibration programming steps
Calibration step Calibrator voltage Calibration command* Parameter range
+10V
-10V
100V +10.00000V
-10.00000V
100.0000V :CAL:PROT:DC:STEP3 10
:CAL:PROT:DC:STEP4 -10
:CAL:PROT:DC:STEP5 100 9 to 11
-9 to -11
90 to 110
*Use recommended value where possible. Change parameter accordingly if using a different calibrator voltage.
Table 2-9
Resistance calibration programming steps
Calibration
step Calibrator
resistance
Calibration command* Parameter range
1k
Ω
10k
Ω
100k
Ω
1M
Ω
1k
Ω
10k
Ω
100k
Ω
1M
Ω
:CAL:PROT:DC:STEP6 1E3
:CAL:PROT:DC:STEP7 10E3
:CAL:PROT:DC:STEP8 100E3
:CAL:PROT:DC:STEP9 1E6 900 to 1.1E3
9E3 to 11E3
90E3 to 110E3
900E3 to 1.1E6
*Use exact calibrator resistance value for parameter.