User manual

Section 8: Scanning Series 3700 System Switch/Multimeter Reference Manual
8-6 3700S-901-01 Rev. C / July 2008
Triggers
The following four action triggers are associated with the trigger model
operation:
Arm Action Trigger
Channel Action Trigger (this trigger may be bypassed for the first channel of
the first scan count)
Sequence Action Trigger
Measure Action Trigger
STEP operation: When the trigger event is detected, a channel is closed and a
measurement may be taken, if it is configured for one. The step operation, which
is only available over the front panel, processes one step at a time until all steps
are completed.
SCAN operation: When the trigger event is detected, all the channels in the
scan list are scanned. The scan operation processes all steps before finishing.
The channel closing occurs when the channel stimulus event is detected. After
closing the channels, the Channel Ready Event is generated. See the Channel
Action Trigger in the trigger model figure in Trigger model (on page 8-4). Before
the measurement occurs, the sequence and measure stimulus events must be
detected. One or both of these events may be used.
After the measurement is completed, a Measure Event Complete message is
generated. If a sequence of measurements is taken, a Sequence Complete
Event message is generated after all measurements are taken (that is, the
measure count reaches zero). Use the sequence stimulus event if you want
each measurement to be paced by an event. Otherwise, use the measure event
stimulus to have a single event trigger all of the measure count readings.
When all steps are complete, the Scan Complete Event message is generated.
Otherwise, it loops back to the Channel Action Trigger. When all scans are
complete, the Idle Event is generated. Otherwise, it loops back to the Arm Action
Trigger.
Stimulus
Description
Arm Action Trigger
Affects the "Wait Scan Start Trigger" block of the trigger model. This
trigger is associated with the ICL
scan.trigger.arm.stimulus (on page 13-244).
Channel Action Trigger
Affects the "Wait Channel Start Trigger" block of the trigger model.
This trigger is associated with the ICL
scan.trigger.channel.stimulus (on page 13-246).
Sequence Action Trigger
Affects the "Wait Sequence Trigger" block of the trigger model. This
trigger is associated with the ICL
scan.trigger.sequence.stimulus (on page 13-249).