Section 7: Increasing SMU current sourcing ability Model 2651A High Power System SourceMeter® Instrument User's Manual
7-16
2651A-900-01 Rev. A / March 2011
Example program usage
The functions in this script allow the sweep parameters of the test to be adjusted without having to
rewrite and rerun the script. A test can be executed by calling the function
DualSmuRdson(gateLevel, dstart, dstop, dsteps, pulseWidth, pulsePeriod,
pulseLimit)
with the appropriate values passed to it in its parameters.
DualSmuRdson() parameters
Parameter
Units
Description
gateLevel
Volts
The voltage level to hold the gate
dstart
Amperes
The level of the first step in the drain sweep
dstop
Amperes
The level of the last step in the drain sweep
dsteps
Not
applicable
The number of steps in the drain sweep
pulseWidth
Seconds
The width of the pulse in the drain sweep
pulsePeriod
Seconds
The time between the start of consecutive pulses in the drain sweep
pulseLimit
Volts
The voltage limit of the pulses in the drain sweep
An example call to this function is as follows:
DualSmuRdson(10, 1, 100, 100, 500e-6, 50e-3, 10)
This call will set the gate source-measure unit (SMU) output to 10 V and then sweep the drain of the
device from 1 A to 100 A in 100 points. The points of this sweep will be gathered using pulsed
measurements with a pulse width of 500 µs and a pulse period of 50 ms for a 1 percent duty cycle.
These pulses will be limited to a maximum of 10 V. At the end of the sweep, all SMU outputs will be
turned off. The resulting data from this test will be returned in a Microsoft
®
Excel
®
compatible format
(you can cut and paste the output from the console) that can be used for graphing and analysis.
