Keithley 2651A Reference Manual page 733

Model 2651A High Power System SourceMeter® Instrument Reference Manual
If you do not wish to set a calibration date or calibration due date and want to clear the previous
values, use the following commands:
smua.cal.date = 0
smua.cal.due = 0
The actual year, month, and day, as well as (optional) hour, and minute should be used (seconds can
be given but will essentially be ignored due to the precision of the internal date storage format). The
allowable range for the year is from 2005 to 2037, the month is from 1 to 12, and the day is from 1 to
31.
Step 7. Save calibration constants
Calibration is now complete, so you can store the calibration constants in nonvolatile memory by
sending the following command:
smua.cal.save()
Unless you send the save command, the calibration you just performed will be temporary.
Step 8. Lock out calibration
To lock out further calibration, send the following command after completing the calibration
procedure:
smua.cal.lock()
2651A-901-01 Rev. A / March 2011
NOTE
Appendix B: Calibration
B-33