Keithley 2657A User Manual

A
ppendix B: Calibration Model 2657A High Power System SourceMeter® Instrument Reference Manual
B-26 2657A-901-01 Rev. B/December 2012
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 for the current source and measure function listed in Step
sequence (on page B-17) for each range as follows:
1. Select the range being calibrated:
smua.source.rangei = range
2. Select the correct sense mode based on the calibration step for the current source and measure
function listed in Step sequence
(on page B-17), 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 Model 2657A current readings at the
positive zero value (the Model 2657A 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 Model 2657A:
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 = 120e-3
8. Turn on the output:
smua.source.output = smua.OUTPUT_ON
9. Allow the readings to settle, then get both the multimeter and Model 2657A current readings at the
positive full-scale output value (the Model 2657A 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 Model 2657A:
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
= The present calibration range
src_Z
= The +zero Model 2657A programmed source output value
DMM_Z_rdg
= The +zero DMM measurement
src_FS
= The +FS Model 2657A programmed source output value
DMM_FS_rdg
= The +FS DMM measurement
NOTE

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English