Section 3: Functions and features Model 2651A High Power System SourceMeter® Instrument Reference Manual
3-42 2651A-901-01 Rev. A / March 2011
Hardware trigger mode summary
Trigger mode Output Input
Unasserted Asserted Detects
Bypass N/A N/A N/A
Either Edge High Low Either
Falling Edge High Low Falling
Rising Edge The programmed state of the line determines if the
behavior is similar to RisingA or RisingM:
• High similar to RisingA
• Low similar to RisingM
RisingA High Low Rising
RisingM Low High None
Synchronous High latching Low Falling
SynchronousA High latching High Falling
SynchronousM High Low Rising
Pulsewidth
Specifies the pulse width of the output trigger signal when the hardware line is asserted.
Trigger configuration on hardware lines
The Model 2651A can be configured to send digital signals to trigger external instruments. Linking
these output triggers to the completion of certain source-measure actions enables hardware
handshaking. The programming example below illustrates this:
-- Configure the Model 2651A to detect a rising
-- edge on digital I/O line 2.
digio.trigger[2].mode = digio.TRIG_RISINGA
digio.trigger[2].clear()
-- Configure SMU A to start its source action when a
-- trigger event occurs on digital I/O line 2.
smua.trigger.source.stimulus = digio.trigger[2].EVENT_ID
-- Configure digital I/O line 4 to output a 1 ms
-- rising-edge trigger pulse at the completion of
-- SMU sweep.
digio.trigger[4].mode = digio.TRIG_RISINGM
digio.trigger[4].pulsewidth = 0.001
digio.trigger[4].stimulus = smua.trigger.SWEEP_COMPLETE_EVENT_ID
This example’s triggering setup is shown in the following figure.
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