ADLINK PXI-2006 - Manual (Page 47)

Operation Theory 37
If the trigger event occurs when a scan is in progress, the stored N
scans of data would include this scan, as illustrated in Figure 4-9.
Figure 4-9: Middle trigger (trigger occurs when a scan is in progress)
Note:M_counter defined in Middle-Trigger is different from that of
Pre-Trigger. In Middle-trigger, M_Counter ends counting before
the trigger event while in Pre-Trigger, M_Counter ends counting
right at or before trigger event. Please refer to Figure 4-6 and Fig-
ure 4-9.
Post-Trigger Acquisition
Use post-trigger acquisition in applications where you want to col-
lect data after a trigger event. The number of scans after the trig-
ger is specified in PSC_counter, as illustrated in Figure 4-10. The
total acquired data length = number of enable-channel *
PSC_counter.