FFT says after removal of offset CC

I'm new to labview pls. I tried to remove the offset CC of a sinusoidal signal generated, but pointed out that the fft does not work well, he sees only the magnitude of the amplitude of the first. However, if I connect the signal directly without removal of dc, it works well. Can someone advise on what to do because it is important that I have remove the DC offset. And I don't want to presume that I am aware of the offset. My VI is attached.

Use a slightly different technique to remove the offset. The DC - RMS.vi on average produces a waveform of offset values while you really want only a single scalar value. Use the Mean.vi (math > probability & statistics palette).

There is no need to feed a waveform to the FFT.vi because it does not appear that the values of Y. If you want a cluster like waveform to feed to the chart, you can create your own from the sample rate and the number of samples or use the FFT (Mag Phase) VI spectrum in the range of Signal Processing.

You also seem to have an aversion to the sons of the straight.  It is much easier to read and understand a block diagram if the wires have a minimum number of elbows and do not pass behind other objects.

Lynn

Tags: NI Software

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