ADLINK USB-2405 - Manual (Page 48)

38 Operation
before and after trigger event can be set individually (M and N
samples), as shown. Please note that M+N must be equal to or
less than 8k samples for all analog input channels, and that the
trigger event can only be accepted when the specified amount of
data has been acquired (M samples), otherwise the trigger event
will be ignored.
Figure 3-13: Middle-Trigger Acquisition
Gated Trigger
Gated-trigger acquisition is indicated in applications where data is
to be collected when trigger events are set to level high/low, and
acquisition suspended when trigger events are set to the opposite
level. The process repeats until the specified amount of data is
acquired.
Figure 3-14: Gated Trigger
Post-Trigger or Delay-Trigger Acquisition with Re-Trigger
Post-trigger or delay-trigger acquisition with re-trigger function is
indicated in applications where data is to be collected after several
trigger events. The number of scans after each trigger and the
Time
ƔOperation start
ƔAcquisition start
Trigger
Data
ƔTrigger Event Occurs
ƔAcquisition stop
ƔBegin to transfer data to
system
N samples
This data is
discarded.
Only acquired N
samples will be
transferred back to
system.
Time
ƔOperation start
ƔAcquisition start
Trigger
Data N samples M samples
ƔTrigger event occurs
(high active)
ƔTrigger event occurs
(high active)
ƔƔƔƔ