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Section 4: Triggering Series 2600B System SourceMeter® instrument Reference Manual

4-8 2600BS-901-01 Rev. F/August 2021

SMU event detectors

As shown in Using the remote trigger model (on page 4-3), the source-measure unit (SMU) has

multiple event detectors to control the timing of various actions, as shown in the table below. Each

event detector monitors for the trigger event assigned to the associated stimulus input. Operation

through the trigger model is delayed at the event detector until the programmed trigger event occurs.

If the stimulus input is set to zero (0), the SMU continues uninterrupted through the remote

trigger model.

Event detectors

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.

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 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 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).

Tektronix KEITHLEY 2600B Series User Manual

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