Keithley 2651A

Model 2651A High Power System SourceMeter® Instrument Reference Manual Appendix B: Calibration
2651A-901-01 Rev. A / March 2011 B-29
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.leveli = -90e-3
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 current 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 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()
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.calibratei(-range, src_Z, DMM_Z_rdg, src_FS, DMM_FS_rdg)
Where:
-range
= The negative of the present calibration range
src_Z
= The zero Model 2651A source output value
DMM_Z_rdg
= The zero DMM measurement
src_FS
= The FS Model 2651A source output value
DMM_FS_rdg
= The FS DMM measurement
Typical values for the 100 mA range:
smua.source.calibratei(-100e-3, -1e-30, -1e-6, -90e-3, -89.2e-3)
22. If this step is not on the CALA sense mode or 100 A range, send the measure calibration
command using the multimeter and Model 2651A readings, and range setting for the
parameters:
smua.measure.calibratei(-range, Z_rdg, DMM_Z_rdg, FS_rdg, DMM_FS_rdg)
Where:
-range
= The negative of the present calibration range
Z_rdg
= The zero Model 2651A measurement
DMM_Z_rdg
= The zero DMM measurement
FS_rdg
= The FS Model 2651A measurement
DMM_FS_rdg
= The FS DMM measurement
Typical 100 mA range values:
smua.measure.calibratei(-100e-3, -1e-5, -1e-6, -91e-3, -89.2e-3)