Tektronix KEITHLEY SourceMeter 2606B Reference Manual page 181

Section 7: Triggering
Event detectors
Event detector
Arm
Source
Measure
End pulse
For the SMU, action overruns occur when a new trigger is detected before the previous trigger is
acted upon. When the trigger model is configured for asynchronous measurements, a measurement
trigger generates an overrun if the SMU is not ready to start a new measurement.
Clearing SMU event detectors
When an event detector is cleared, the event detector discards previously detected trigger events.
This prevents the source-measure unit (SMU) from using trigger events that were detected during the
last sweep or while it is 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() function*.
•
The SMU moves from the arm layer into the trigger layer and the smuX.trigger.autoclear
attribute is enabled.
* smuX can be smua for channel A or smub for channel B
Using the TRIG key to trigger a sweep
You can configure the source-measure unit (SMU) to perform a sweep in which each source step is
triggered by the virtual front-panel TRIG key. The source action is preceded by the source event
detector. 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 TRIG key is pressed.
To configure the virtual front-panel TRIG key to trigger the source action, assign the trigger event
created by the TRIG key (display.trigger.EVENT_ID) to the source stimulus input
(smuX.trigger.source.stimulus).
The programming example below illustrates how to configure a 10-point linear voltage sweep on SMU
A, in which each step is triggered by the TRIG key:
7-8
Model 2606B System SourceMeter® Instrument Reference Manual
Function
Controls entry into the trigger layer of the trigger model.
Controls execution of the source action.
Controls execution of the measurement action.
Controls execution of the end pulse action.
2606B-901-01 Rev. C November 2021