Why is - this vi gives the result of wrong time?

I have a NI 9401 and I found this example, using Labview 2011, I understand should measure the pulse width.  I have a photo with transistor output sensor that displays 12mVDC in the low State, and ~ 3700mVDC to a high State.  When I run this vi, (I added the WHILE loop to the original example) and I use my photo sensor manually, which means that there are hundreds of ms between rising or falling edges, the output is of a few microseconds?  Why t - he display such a short pulse width? I use cDAQ 9174.  I'd wait the time difference between the successive rising or falling edges to be in the hundreds of ms, not microseconds.


Tags: NI Hardware

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