waveform analysis help

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Okay, that looks like a very rough, and I mean VERY rough full-wave-rectified sine wave.  Odd harmonics would make the top and bottom symmetrical, like a square or triangle wave, and since this is NOT that, I'd say it has strong second and other even harmonics. And that is of course in addition to the noise.

But regarding the making of this plot, well, you know how engineers can be, so full of piss and vinegar...
 

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