2600AS-901-01 Rev. B / September 2008
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10-7
Series 2600A System SourceMeter® Instruments Reference Manual
Section 10: Triggering
Table 10-2
Event detectors
Clearing SMU event detectors
When an event detector is cleared, the event detector discards previously detected trigger events.
This prevents the SMU from using trigger events that were detected during the last sweep or while
in the arm layer and allows it to start monitoring for new trigger events.
SMU event detectors are automatically cleared when:
•
A sweep is initiated using the
smuX.trigger.initiate
command.
•
The SMU moves from the arm layer into the trigger layer and the
smuX.trigger.autoclear
attribute is enabled.
Using the TRIG key to trigger a sweep
The SMU can be configured to perform a sweep where each source step is triggered by the front
panel
TRIG
key. The source action is preceded by the source event detector (see
The SMU pauses operation at an event detector until a programmed event occurs. The SMU can
be programmed to wait at the source event detector (that is, not start the source action) until the
front panel
TRIG
key is pressed.
To configure the front panel
TRIG
key to trigger the source action, assign the trigger event created
by the
TRIG
key (
) to the source stimulus input
).
The example below shows a command sequence to configure a ten-point linear voltage sweep on
SMU A where each step is triggered by the front panel
TRIG
key:
-- Configure a 10-point source voltage sweep.
smua.trigger.source.linearv(1, 10, 10)
smua.trigger.source.action = smua.ENABLE
-- Configure TRIG key press as input trigger for source action.
smua.trigger.source.stimulus = display.trigger.EVENT_ID
-- Command SMU to execute a single 10-point sweep.
smua.trigger.count = 10
smua..trigger.arm.count = 1
-- Turn on the output in preparation for the sweep
smua.source.output = suma.OUTPUT_ON
-- Start the sweep and clear the event detectors.
smua.trigger.initiate()
-- The SMU will wait for the front panel TRIG key press before executing
-- each source action.
Event detector Function
Arm
Controls entry into the trigger layer of the trigger model.
Source
Controls execution of the source action.
Measure
Controls execution of the measurement action.
End pulse
Controls execution of the end pulse action.
