waveform analysis help

Can anyone help pick out the harmonics on this waveform?

There appears to be a fundamental of about 1.5 hz, but there is a lot of noise in the signal masking the harmonics.

Plot was made with an "inkjet chart recorder"... sort of.  ;D

https://youtu.be/zxaBtvtkSzE?t=384

Gene

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...

Looks to me like a sore tooth waveform.

Cheers

Ian

Kind of a dirty signal... could be cleaned up.

JR