I have an NI 9401 and I found this example, in the Labview 2011 help, that I understand should measure pulse width. I have a photo sensor with transistor output that outputs 12mVDC in the low state, and ~3700mVDC in the high state. When I run this vi, (I added the WHILE loop to the original example) and I operate my photo sensor manually, which means that there are hundreds of ms in between rising or falling edges, the output is a few microseconds? Why does it display such a short pulse width? I am using cDAQ 9174. I would expect the difference in time between successive rising or falling edges to be in the hundreds of ms, not a few microseconds.

Counter/Timer

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We found a hardware modification that cured the problem, so, no need for reply.

Thanks,

Dave

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