Keithley 2651A Reference Manual page 732

Appendix B: Calibration
D. Allow the readings to settle, then get the Model 2651A readings:
r50_hi, r50_lo = smua.contact.r()
E. Send the contact check low calibration command:
smua.contact.calibratelo(r0_lo, Z_actual, r50_lo, 50_ohm_actual)
Where:
r0_lo
Z_actual
r50_lo
50_ohm_actual = Actual 50 Ω resistor value; the actual value of the resistor between the SENSE
Typical values:
smua.contact.calibratelo(r0_lo, 0, r50_lo, 50.15)
Where r0_lo is the same value as measured in step B, and r50_lo is the same value as
measured in step D.
F. Send the contact check high calibration command:
smua.contact.calibratehi(r0_hi, Z_actual, r50_hi, 50_ohm_actual)
Where:
r0_hi
Z_actual
r50_hi
50_ohm_actual = Actual 50 Ω resistor value; the value of the resistor between the SENSE HI and
Typical values:
smua.contact.calibratehi(r0_hi, 0, r50_hi, 50.15)
Where r0_hi is the same value as measured in step B, and r50_hi is the same value as
measured in step D.
Step 6. Program calibration dates
Use the following command to set the calibration adjustment date:
smua.cal.adjustdate = os.time{year=2010, month=12, day=1}
Optionally, it is possible to set the calibration date and calibration due date with the following
commands:
smua.cal.date = os.time{year=2010, month=12, day=1}
smua.cal.due = os.time{year=2011, month=12, day=1}
B-32
Model 2651A High Power System SourceMeter® Instrument Reference Manual
= Model 2651A 0 Ω low measurement
= Actual zero value; the resistance of the short between the SENSE LO and
OUTPUT LO terminals
= Model 2651A 50 Ω low measurement
LO and OUTPUT LO terminals
= Model 2651A 0 Ω high measurement
= Actual zero value; the resistance of the short between the SENSE HI anD
OUTPUT HI terminals
= Model 2651A 50 Ω high measurement
OUTPUT HI terminals
2651A-901-01 Rev. A / March 2011