Can not measure freqency

[xseadog]

Hi

Had a quick look at your vi  _uggh  have to spend time just to understand where your wires are going and comming from

What would be most helpful is if you ran the vi again whilst '  connected up' and saved the  vi values: under edit menu push the make current valeus default

That way  post data analysis can be perform with out involving the DAQ card.

xseadog

[ASIAN INSTITUE]

Hi,,

I want to measure the RPM ( rotation per min ) of a roller by using photomicrosensor of Omron. The output of the sensor should be pulse waveform. If I could measure the frequecy of the waveform , I will know RPM.

However, the pulse waveform I got that has noise thus i did compare the waveform applitude ( Voltage ) with constant value in order to cut the noise, then rebuit the new waveform that its waveform voltage is real pulse.

But I can not measure the frequency althought I used some tool such as Tone Measurement...

The attached file below is my program.

Please help me .

[DuffmanSays]

You mentioned that you cannot measure the frequency that you expect. What results do you see? Are you sure that the signal looks as you expect while you use the frequency detect algorithm? I would suggest using the highlight execution mode or some other of the LabVIEW debugging tools. If you can describe the behavior that you see, we can offer much more helpful advice.

Also, you are using the DAQ assistant in your example. Would the same results occur with simulated data? This would allow us to run your code. I hope this information is useful. Thanks,

Mike D.