Keithley 2600a series, Reference Manual, Page: 90 / 696

3-18 Return to Section Topics 2600AS-901-01 Rev. B / September 2008
Section 3: Basic Operation Series 2600A System SourceMeter® Instruments Reference Manual
Power programming example
The set-up and command sequence for a typical power measurement is shown below:
• Source function: voltage, auto source range, 5V output
• Current measure function and range: current, auto
• Current compliance: 50mA
smua.reset() --Restore Series 2600A 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 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
Figure 3-5 , where R
C
is the resistance of the mechanical contact at the
DUT, and R
S
is the series resistance of relays and cables.
WARNING Hazardous voltages may be present on the output and guard
terminals. To prevent electrical shock that could cause injury or
death, NEVER make or break connections to the Series 2600A
while the output is on. Power off the equipment from the front
panel or disconnect the main power cord from the rear of the
SourceMeter instrument before handling cables connected to the
outputs. Putting the equipment into standby does not guarantee
the outputs are not powered if a hardware or software fault occurs.