Hello all, I am going through the debugging stage of my small vi and found an inconsistency that does not make sense. My goal is to generate a single TTL pulse as soon as I discover a zero crossing of a sine wave. So I generate a simple sine wave and send a logical true to the block that supposedly should initiate TTL pulse generation. I first tested at 1Hz sine wave, and optained 1Hz TTL pulse. I then set my sine funnction to 5Hz, but still I got only 1Hz TTL signal, instead of 5Hz(1 pulse at each zero crossing of a 5Hz sine wave). Can anybody suggest where the problem might be? Thank you in advance!

I believe your problem is easily explained by one sentence in the help for the zero-crossing VI: "If you wire a waveform value or a dynamic data type value to input data point, this VI evaluates only the first value of the input data."

LabVIEW

Single Pulse TTL

Solved!

Hi GerdW

Thank you very much for your help. I think it is a better to find a new device.

Have a good day!

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LabVIEW

Single Pulse TTL

Re: Single Pulse TTL