© National Instruments | 2-9
NI 6612 User Manual
When the reference trigger occurs, the device continues to write samples to the buffer until the
buffer contains the number of posttrigger samples desired. Figure 2-6
shows the final buffer.
Figure 2-6. Reference Trigger Final Buffer
Using a Digital Source
To use DI Reference Trigger with a digital source, specify a source and an edge. You can route
many signals to DI Reference Trigger. To view the complete list of possible routes, see the
Device Routes tab in MAX. Refer to Device Routing in MAX in the NI-DAQmx Help or the
LabVIEW Help for more information.
You also can specify whether the measurement acquisition stops on the rising- or falling-edge of
DI Reference Trigger.
Routing DI Reference Trigger Signal to an Output Terminal
DI Reference Trigger can be routed out to any PFI <0..39>, RTSI <0..7>, PXI_Trig <0..7>, or
PXIe-DSTARC terminal. All PFI terminals are configured as inputs by default.
DI Pause Trigger Signal
The DI Pause Trigger (di/PauseTrigger) signal can be used to pause and resume a measurement
acquisition. The internal sample clock pauses while the external trigger signal is active and
resumes when the signal is inactive. The active level of the pause trigger can be programmed to
be high or low, as shown in Figure 2-7. In the figure, T represents the period, and A represents
the unknown time between the clock pulse and the posttrigger.
Reference Trigger
Pretrigger Samples
Complete Buffer
Posttrigger Samples
To Next Page
Loading...
Need help?
General
