User manual

PCIE-1744 User Manual 30
4.2.4 Delay Trigger Acquisition Mode
In delay trigger mode, data acquisition will be activated after a preset
delay number of sample has been taken after the trigger event. The delay
number of sample ranges from 2 to 65535 as defined in DMA counter.
Delay-trigger acquisition starts when the PCIE-1744 detects the trigger
event and stop when the specified number of A/D samples has been
acquired or when you stop the operation. This triggering mode must work
with the DMA data transfer mode enabled. Please specify the following
parameters after the Delay-Trigger Acquisition Mode has been set.
• The sample clock source and sampling rate
• The trigger source
• The acquired sample number N
• The sample number M delays after the delay-trigger event happened
Figure 4.2: Delay-Trigger Acquisition Mode