Keithley 2601B Reference Manual page 773

Series 2600B System SourceMeter® Instrument Reference Manual
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.
C. Perform each calibration step listed in Model 2601B/2602B/2604B step sequence, Model
2611B/2612B/2614B step sequence, or Model 2634B/2635B/2636B step sequence for the 100
nA through 1 A ranges as follows:
1. Select the range being calibrated:
smua.source.rangei = range
2. Select the correct sense mode based on the calibration step Model 2601B/2602B/2604B step
sequence, Model 2611B/2612B/2614B step sequence, or Model 2634B/2635B/2636B step sequence,
for example:
smua.sense = smua.SENSE_LOCAL
3. Select positive polarity, then set the source output to the positive zero value:
smua.cal.polarity = smua.CAL_POSITIVE
smua.source.leveli = 1e-30
4. Turn on the output:
smua.source.output = smua.OUTPUT_ON
5. Allow the readings to settle, then get both the multimeter and Series 2600B current readings at the
positive zero value (the Series 2600B 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 Series 2600B:
Z_rdg = smua.measure.i()
6. Turn off the output:
smua.source.output = smua.OUTPUT_OFF
7. Set the source output to the positive full-scale value for the present range, for example:
smua.source.leveli = 90e-3
8. Turn on the output:
smua.source.output = smua.OUTPUT_ON
9. Allow the readings to settle, then get both the multimeter and Series 2600B current readings at the
positive full-scale output value (the Series 2600B measurement is not necessary if calibration 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 Series 2600B:
FS_rdg = smua.measure.i()
10. Turn off the output:
smua.source.output = smua.OUTPUT_OFF
11. 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
src_Z
DMM_Z_rdg
src_FS
DMM_FS_rdg
2600BS-901-01 Rev. B / May 2013
= The present calibration range
= The +zero Series 2600B source output value
= The +zero DMM measurement
= The +FS Series 2600B source output value
= The +FS DMM measurement
Appendix B: Calibration
B-31