Keithley 2601 Reference Manual page 456

Section 16: Calibration
NOTE (Note that it is not necessary to set the measure range for
16-10
calibration.) For example, for the Model 2601/2602 1V range, the
following command would be sent:
smua.source.rangev = 1
For the Model s2611/2612/2635/2636 2V range, the following
command would be sent:
smua.source.rangev = 2
2) Select the correct sense mode based on the calibration step from
Table 16-3, or Table
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.levelv = 1e-10
4) Turn on the output:
smua.source.output = smua.OUTPUT_ON
5) Allow the readings to settle, then get both the multimeter and Series 2600 voltage
readings at the positive zero value (the Series 2600 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 2600:
Z_rdg = smua.measure.v()
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.levelv = 0.9 Model 2601/2602
smua.source.levelv = 1.8 Model 2611/2612/2635/2636
8) Turn on the output:
smua.source.output = smua.OUTPUT_ON
9) Allow the readings to settle, then get both the multimeter and Series 2600 voltage
readings at the positive full-scale output value (the Series 2600 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 2600:
FS_rdg = smua.measure.v()
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.calibratev(range,src_Z,DMM_Z_rdg,
src_FS,DMM_FS_rdg)
Where:
range
src_Z
DMM_Z_rdg
src_FS
DMM_FS_rdg
Typical values for the Model 2601/2602 1V range:
smua.source.calibratev(1,1e-10,1e-5,0.9,0.903)
12) Typical values for the Models 2611/2612/2635/2636 2V range:
smua.source.calibratev(2,1e-10,1e-5,1.8,1.802)
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Series 2600 System SourceMeter® Instruments Reference Manual
16-4, for example:
present calibration range
+zero 2600 source output value
+zero DMM measurement
+FS 2600 source output value
+FS DMM measurement
Table 16-2, or
2600S-901-01 Rev. C / January 2008