16
Figure 3-6: Delayed Trigger Mode Acquisition
3�4�3 Pre-Trigger Mode
Collects data before the trigger event, starting once specified function calls are executed to begin the
pre-trigger 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 trigger
event by a specified amount, as follows.
Time
Operation start
Acquisition start
Trigger
Data
Trigger Event Occurs
Acquisition stop
Data transfer to system begins
N samples
X samples have been acquired
before trigger occurs, where X<N
Trigger signals occuring before the specified
amount of data has been acquired are ignored
Figure 3-7: Pre-Trigger Mode Acquisition
3�4�4 Middle Trigger Mode
Collects data before and after the trigger event, with the amount to be collected set individually (M
and N samples), as follows
Time
Operation start
Acquisition start
Trigger
Data
Acquisition stop
Data transfer to system begins
N samples
M samples
Trigger event occurs
Figure 3-8: Middle Trigger Mode Acquisition
