Keithley 2657A, Reference Manual, Page: 732 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Appendix B: Calibration
2657A-901-01 Rev. B/December 2012 B-23
B. Send the following commands in order to initialize voltage calibration:
smua.cal.unlock("KI0026XX")
smua.reset()
smua.source.func = smua.OUTPUT_DCVOLTS
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.
C. Perform each calibration adjustment for the voltage source and measure function step listed in
Step sequence (on page B-17) as follows:
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 Step sequence (on page B-17), for example:
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 2657A voltage readings at the
positive zero value (the Model 2657A 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 2657A:
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 = 180
8. Turn on the output:
smua.source.output = smua.OUTPUT_ON
9. Allow the readings to settle, then get both the multimeter and Model 2657A voltage readings at the
positive full-scale output value (the Model 2657A 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 2657A:
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
= The present calibration range
src_Z
= The +zero Model 2657A programmed source output value
DMM_Z_rdg
= The +zero DMM measurement
src_FS
= The +FS Model 2657A programmed source output value
DMM_FS_rdg
= The +FS DMM measurement
Typical values for the Model 2657A 200 V range:
NOTE