I am having problems acquiring data with pretrigger samples when capturing more than one channel, using NI-PXI-6071E hardware and Labview's Analog Input VIs (Legacy NI-DAQ).
My goal is to trigger on one signal, while capturing another. Unfortunately, I cannot use the PFI0 for external triggering, as our cables/hardware have already been built, so I must use an analog input channel as the trigger. I understand that to do so I must capture both channels, and the channel that I wish to trigger off of must be the first channel in the list.
If I trigger and capture on the same channel (tried 1-4) then it
works great, regardless of the number of pre-trigger samples set. If I
capture more than one channel (passing the trigger channel first), with no pretrigger samples set, then triggering and capturing both work fine. However, if I do the same with the pretrigger sample > 0 I get the following error:
Error -10621 occurred at AI Control. Possible reason(s):
NI-DAQ LV: The specified trigger signal cannot be assigned to the trigger resource.
I don't se any such limitation explained in the user manual, and searching the forum, I have found a few other people that had the
same
problem
but they did not have solutions. Any ideas?
