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2600S-900-01 Rev. C / January 2008 Return to Section Topics B-11

Series 2600 System SourceMeter

Instruments User’s Manual Appendix B: Frequently Asked Questions

Low-current measurement programming example

The command sequence for typical low-current measurements is shown below. The sequence

assumes that a 100GΩ resistor is being tested. These commands set the output voltage to 100V

and then measure and display both the current through the device as well as the resistance.

smua.reset() - Restore defaults.

smua.source.func = smua.OUTPUT_DCVOLTS - Set source to DCV.

smua.source.rangev = 200 - Select 200V source range

smua.source.levelv = 100 - Output 100V DC.

smua.measure.rangei = 1e-9 - Select 1nA range.

smua.source.limiti = 1e-9 - Set current limit to 1nA

smua.source.output = smua.OUTPUT_ON - Turn on output.

print(smua.measure.i()) - Display current reading.

print(smua.measure.r()) - Display resistance reading.

smua.source.output = smua.OUTPUT_OFF - Turn off output.

Keithley 2635 User Manual

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