Keithley 2651A Reference Manual page 727

Model 2651A High Power System SourceMeter® Instrument Reference Manual
A. Connect the Model 2651A to the digital multimeter (see the figure above), and then select the
multimeter DC current function.
B. Send this command to initialize current calibration:
smua.source.func = smua.OUTPUT_DCAMPS
C. Perform each calibration step for the current source and measure function listed in
step sequence
1. Select the range being calibrated:
smua.source.rangei = range
It is not necessary to set the measure range when following this procedure for calibration because the
measure range is locked to the source range when measuring the source function.
2. Select the correct sense mode based on the calibration step for the current source and
measure function listed in
smua.sense = smua.SENSE_LOCAL
3. Select positive polarity, then set the source output to the positive zero value:
smua.cal.polarity = smua.CAL_POSITIVE
smua.source.leveli = 1e-30
4. Turn on the output:
smua.source.output = smua.OUTPUT_ON
5. Allow the readings to settle, then get both the multimeter and Model 2651A current readings
at the positive zero value (the Model 2651A measurement is not necessary if this calibration
step is being done on the CALA sense mode or 100 A range). The two measurements should
be made as close as possible in time. Use this command for the Model 2651A:
Z_rdg = smua.measure.i()
6. Turn off the output:
smua.source.output = smua.OUTPUT_OFF
7. Set the source output to the positive full-scale value for the present range, for example:
smua.source.leveli = 90e-3
8. Turn on the output:
smua.source.output = smua.OUTPUT_ON
9. Allow the readings to settle, then get both the multimeter and Model 2651A voltage readings
at the positive full-scale output value (the Model 2651A measurement is not necessary if
calibration is being done on the CALA sense mode or 100 A range). The two measurements
should be made as close as possible in time. Use this command for the Model 2651A:
FS_rdg = smua.measure.i()
2651A-901-01 Rev. A / March 2011
(on page B-19) for the 100 mA range and below as follows:
Model 2651A step sequence
NOTE
(on page B-19), for example:
Appendix B: Calibration
Model 2651A
B-27