Triggering 10-5
Trigger layer
The Trigger Layer uses three event detectors; one for each action (Source, Delay, and
Measure).
Event Detector Bypass — As shown in Figure 10-1, there is a bypass for the Source Event
Detector. This bypass is in effect only if Trigger Link is the selected Trigger-In Source. With
this event detector bypass set to ONCE, operation will proceed around the Source Event
Detector.
The programmable trigger-in sources for the Trigger Layer are described as follows:
IMMEDIATE — With Immediate selected, event detection for the three detectors is satis-
fied immediately. Operation proceeds through the Trigger Layer to perform the Source, Delay,
and Measure actions.
TRIGGER LINK — With Trigger Link selected, event detection at each enabled detector
occurs when an input trigger via the Trigger Link input line is received. For example, if the
Trigger In Event for the Source Event Detector is ON, operation will hold up at that detector
until an input trigger is received. If, however, the Source Event Detector is disabled (OFF),
operation will not hold up. Operation will simply continue on and perform the Source action.
With the Trigger Link Trigger-In Source selected, operation will go around the Source Event
Detector (Figure 10-1) by setting the event detector bypass to ONCE.
Trigger delay
A programmable delay is available before the Source Action. The Trigger Delay can be
manually set from 0.00000 to 999.99990 seconds. Note that this delay is separate from the
Delay Action of the SDM cycle. The Delay Action is discussed next.
Source, delay, and measure actions
The SDM cycle of the SourceMeter consists of three actions: Source, Delay, and Measure:
SOURCE Action — Any programmed output voltage or current level changes are per-
formed.
DELAY Action — This programmable delay is used to allow the source to settle before a
measurement is performed. It can be manually set from 0.00000 to 9999.99900 seconds, or
Auto Delay can be enabled. With Auto Delay enabled, the SourceMeter automatically selects a
nominal delay period based on the selected function and range.
NOTE The Delay Action is set from the CONFIGURE V-SOURCE or CONFIGURE
I-SOURCE menu. See Section 3, “Source delay.”
In MULTIPLE mode, the soak time takes the place of the delay time only during the
first SDM cycle after the initial sweep trigger. See Section 6, “Auto range change
mode.”
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