ADLINK Technology MCM-100, User Manual

Page: 59 / 117

Operation 43
MCM-100/102
Trigger Modes
Analog input supports post, delay, middle, gate, post trigger with
retrigger, and delay trigger with retrigger modes.
Post-Trigger Acquisition Mode (no retrigger)
Post-trigger acquisition is indicated in applications where data
is to be collected after a trigger event, as shown.
Figure 4-8: Post Trigger without Retrigger
Pre-trigger Acquisition (no retrigger)
Collects data before the trigger event, with acquisition starting
once specified function calls are executed to begin the pre-trig-
ger operation, and stopping when the trigger event occurs. If
the trigger event occurs after the specified amount of data has
been acquired, the system stores only data preceding the trig-
ger event by a specified amount, as shown. Note that N must
be equal to or less than 8k samples for all analog input chan-
nels.
Time
Ɣ Operation
start
Trigger
N samples Data
Ɣ
Trigger Event Occurs
Ɣ Acquisition start
Ɣ Acquisition stop
Ɣ Begin to transfer data to system