Tektronix Keithley 2651A Reference Manual page 854

Section 12: Calibration
C. Perform each calibration adjustment for the voltage source and measure function step listed in
Step sequence
1. Select the range being calibrated with this command:
smua.source.rangev = range
2. Select the correct sense mode based on the calibration step for the voltage source and measure
function from the
smua.sense = smua.SENSE_LOCAL
3. Select positive polarity, and then set the source output to the positive zero value. For example:
smua.cal.polarity = smua.CAL_POSITIVE
smua.source.levelv = 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 voltage 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). The two measurements should be made as close as possible in time.
Use this command for the Model 2651A:
Z_rdg = smua.measure.v()
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.levelv = 0.9
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 this calibration step is
being done on the CALA sense mode). The two measurements should be made as close as possible in
time. Use this command for the Model 2651A:
FS_rdg = smua.measure.v()
10. Turn off the output:
smua.source.output = smua.OUTPUT_OFF
11. Send the source calibration command using the range, +zero and +FS multimeter readings, and +zero
and +FS source values for the parameters:
smua.source.calibratev(range, src_Z, DMM_Z_rdg, src_FS, DMM_FS_rdg)
Where:
range
src_Z
DMM_Z_rdg
src_FS
DMM_FS_rdg
Typical values for the Model 2651A 1 V range:
smua.source.calibratev(1, 1e-30, 1e-5, 0.9, 0.903)
12-24
Model 2651A High Power System SourceMeter® Instrument Reference Manual
(on page 12-19) as follows:
Step sequence (on page 12-19), for example:
= The present calibration range
= The +zero Model 2651A programmed source output value
= The +zero DMM measurement
= The +FS Model 2651A programmed source output value
= The +FS DMM measurement
2651A-901-01 Rev. C October 2021