setting up trigger

[guilio_2000]

I am having difficulty implementing a trigger into my program for the PXI 6143.  The examples I have found are not working.  I know that I can only set up with a digital trigger and I want the card to begin taking samples when it crosses 0.  When I put in the DAQmx vi for the trigger and run it, the clock runs but nothing is collected?  Any ideas or helpful hints?

Thanks,

Travis

[Max Neri]

I had used SCXI 1120D. Like you, I had problems when I use the trigger. If I choose the input 1 to trigger my signal and have no signal there, a erro is showed in screen.

[TheWoost]

Hi Travis,

I'm assuming that you have attempted to run the shipping example Acq&Graph Voltage-Int Clk-Dig Start.vi.  It sounds like this example is most applicable to what you are trying to do.  Verify that you have the digital trigger signal connected to the same line that you have configured in LabVIEW.  You indicate that you want the acquisition to trigger when the digital signal crosses 0.  Does this mean that you are triggering off of a falling edge?  If so, make sure that this parameter is correctly wired in your DAQmx Start Trigger (Digital Edge).vi.

From the behavior you are seeing, it seems like your VI is waiting for the digital trigger to occur but it does not.  Make sure that your external digital signal is giving you a falling edge that you can use as a trigger.

Regards,
Andrew W
National Instruments