Keithley 2651A Reference Manual page 725

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Where:
range
Z_rdg
DMM_Z_rdg
FS_rdg
DMM_FS_rdg
Typical Model 2651A 1 V range values:
smua.measure.calibratev(1, 1e-4, 1e-5, 0.92, 0.903)
13. Select negative polarity, then set the source output to the negative zero value, for example:
smua.cal.polarity = smua.CAL_NEGATIVE
smua.source.levelv = -1e-30
14. Turn on the output:
smua.source.output = smua.OUTPUT_ON
15. Allow the readings to settle, then get both the multimeter and Model 2651A voltage readings
at the negative 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()
16. Turn off the output:
smua.source.output = smua.OUTPUT_OFF
17. Set the source output to the negative full-scale value, for example:
smua.source.levelv = -0.9
18. Turn on the output:
smua.source.output = smua.OUTPUT_ON
19. Allow the readings to settle, then get both the multimeter and Model 2651A voltage readings
at the negative 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()
20. Turn off the output:
smua.source.output = smua.OUTPUT_OFF
21. 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-4, -0.9, -0.896)
2651A-901-01 Rev. A / March 2011
= The present calibration range
= The +zero Model 2651A measurement
= The +zero DMM measurement
= The +FS Model 2651A measurement
= The +FS DMM measurement
= The negative of the present calibration range
= The zero Model 2651A source output value
= The zero DMM measurement
= The FS Model 2651A source output value
= The FS DMM measurement
Appendix B: Calibration
B-25