ADLINK PCI-9820 - Manual (Page 32)

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• Operation Theory
Figure 4.3 Pre trigger (The trigger signal is accepted anytime
after the operation starts)
Figure 4.4 Pre trigger (The trigger signal will be ignored until the
specified amount of data is acquired)
4.3.3 Middle-trigger Acquisition
Use middle-trigger acquisition when you want to collect data before and after
the trigger event. The amount of stored data before and after the trigger can
be set individually (M and N), as illustrated in Fig 4.5.
Acquired &
stored data
Time
Specified
amount of data
Operation
start
Trigger
event
Trigger signals that occur
before the specified amount of
data has been acquired
(shadow area) will be ignored.
Time
Operation
start
Specified
amount of data
Trigger
event
Acquired & stored
data with the speci-
fied amount