Is my PCI Counter Broken?

Updated Jan 4, 2019

Reported In


  • DAQ (Legacy)
  • PCI-6013


  • Measurement & Automation Explorer (MAX)

Issue Details

My PCI counter counts infrequently, or irregularly; is it broken?


It's possible that your PCI cards counter is broken, but there are some tests you can perform to check to see if it is.
A loopback test is the easiest way to determine if your issue has to do with the card or something else in the system.

To perform a loopback test, obtain a secondary DAQ card and output the counter from the PCI card in question to the working DAQ card. NI MAX tasks or test panels can be used to accomplish this, but LabVIEW examples are also an option. Try counting at a frequency slow enough to verify visually it's not skipping. Perform this on all applicable counter outputs to ensure all counters are behaving the same. Repeat this process again, but have the PCI card in question accept a counter output task. Repeat the same process by testing on all applicable lines and inspecting the count value as it increases.


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