Using External Trigger NI 5762, 7966R

[jarrisonwins]

Hi there,

We are using the FlexRIO system to acquire and analyze data from the digitizer. To do this we are triggering off an external source. I noticed that while using this external trigger, if the trigger input stays True for more than a few clock cycles we experience an unwanted retrigger. Besides ensuring a short pulse external trigger, what is the best way to go about solving this issue? We are programming the acquisition engine in LabVIEW.

[Haagen-Dazs · Accepted solution]

Hi Jarrisonwins,

It is possible that the trigger would remain high depending on the sampling rate you are using for the trigger line. Is it possible to send a screenshot of where you are reading the trigger line? We want to make sure that we are only detecting the edge transition and not simply looking at the logic level. Also, have you had a chance to scope the trigger source? Is it possible that you are actually sending more than one rising edge? There should be debounce logic within the trigger line but it may be worthwhile to look at the incoming signal.

[jarrisonwins]

After reading your responsei double checked my wiring and found that the trigger was reading the logic level rather than the rising edge. After fixing this everything seems to be running smoothly! Thanks!