User Manual

2400 Series SourceMeter
®
User’s Manual Triggering 11-5
Trigger layer
The Trigger Layer uses three event detectors; one for each action (Source, Delay,
and Measure). Each of these event detectors can be turned on or off individually.
Event Detector Bypass — As shown in Figure 11-1, 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 fol-
lows:
IMMEDIATE — With Immediate selected, event detection for the three detectors
is satisfied 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.
(See “Trigger link,” page 11-19.) 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 continue and perform the Source action.
With the Trigger Link Trigger-In Source selected, operation will go around the
Source Event Detector (as shown in Figure 11-1) 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
performed.
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.