I need to measure a varying frequency with a 9401 in 9178 chassis. I am using an Express VI. I have the input connected to the 9401 terminal and can read counts just fine expect that the counts per second vary. I compared this to a scope and see that the pulse width varies and thus my frequency varies. When I attempt to measure frequency, I get errors that no data was measured. I also see the note in the Express VI to connect the input to PFI0. This I do not understand. Can someone help me?
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