Get the harmonics

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• How to get the values of phase of the harmonic component digitally?

  Hello

  Basically, what I'm trying to do is to analyze the quality of acquired signals. What interests me are amplitude and phase at some frequencies (for example 50 Hz, 150 Hz, 250 Hz, etc.) of a waveform. I tried to use "measurment spectral express VI' to achieve my goals. It works well, but so far, I can handle only show spectra in graphics. Then, I tried to use "harmonic distortion Vi' to obtain the amplitudes of harmonic components digitally and it's absolutely perfect. My question is that how can I get the phase of the harmonic components digitally?

  Thank you very much

  Hao

  FFT and a manipulation of the results seems to work quite well.

  I used some tones and noise Waveform.vi to generate a test signal. .Vi (Mag Phase) FFT spectrum analysis the signal. I find the amplitude peaks and extract the phases in these places. Results are quite close to the entrance of the values even when the noise is larger than some of the harmonics.

  Lynn

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  w

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  As with many things in the new version of iTunes, changed the way to get information. For example, when you insert a cd, the upper right corner shows CD Info, CD Import, a new icon that looks like a gear wheel! and the eject button. Click the gear and it shows get track names etc.

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