Tektronix Keithley 2651A Reference Manual page 853

Model 2651A High Power System SourceMeter® Instrument Reference Manual
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.
2651A-901-01 Rev. C October 2021
Figure 132: Connections for voltage calibration
Section 12: Calibration
12-23