2600S-901-01 Rev. C / January 2008
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4-17
Series 2600 System SourceMeter® Instruments Reference Manual
Section 4: Basic Operation
Power programming example
The command sequence for a typical power measurement is shown below. These commands set
up the SourceMeter as follows:
• Source function: voltage, auto source range, 5V output
• Current measure function and range: current, auto
• Current compliance: 50mA
smua.reset() --Restore Series 2600 defaults.
smua.source.func = smua.OUTPUT_DCVOLTS --Select voltage
source function.
smua.source.autorangev = smua.AUTORANGE_ON --Set source
range to auto.
smua.source.levelv = 5 --Set voltage source to 5V.
smua.source.limiti = 50e-3 --Set current limit to 50mA.
smua.measure.autorangei = smua.AUTORANGE_ON --Set current
range to auto.
smua.source.output = smua.OUTPUT_ON --Turn on output.
print(smua.measure.p()) --Get power reading.
smua.source.output = smua.OUTPUT_OFF --Turn off output.
Contact check measurements
Overview
The contact check function
1
prevents measurements that may be in error due to excessive
resistance in the force or sense leads when making remotely sensed (Kelvin) measurements.
Potential sources for this resistance include poor contact at the DUT, failing relay contacts on a
switching card, and wires that are too long or thin. The contact check function will also detect an
open circuit that may occur with a four-point probe is misplaced or misaligned. This relationship is
shown schematically in
, where R
C
is the resistance of the mechanical contact at the
DUT, and R
S
is the series resistance of relays and cables.
Models 2601/2602/2611/2612 have the contact check function. Models 2635/2636 do not have the
contact check function.
1. All Model 2611/2612 System SourceMeters manufactured by Keithley Instruments support the contact check function. Models 2635
and 2636 do not support the contact check function. Only Models 2601/2602 with firmware Revision 1.1.0 or later and source
measure unit (SMU) hardware Revision E or later support the contact check function. To determine the firmware and SMU hardware
revisions, inspect the data returned by the print(localnode.info()) command. The InstFwRev and SMUBrdRev keys contain the
necessary information.
