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Don Pearce wrote:

-----------------------------
gray_wolf


Any idea what the catastrophic ringing harmonics would look like on a spectrum
analyzer.

The same is non-catastrophic but bigger. That is just a judgement
call. The way you judge it to be actual ringing is that one harmonic
is much bigger than any other. That is the ringing frequency.


** You sure about "any" ?

Square waves have cascading, odd numbered harmonics.
The ringing one would merely be out of step with the others.

FYI:

I like to test 31 band graphics using just a few square wave frequencies.
40, 300 and 3000Hz for example.
Then move each slider through its full travel and watch the result on my scope.
Malfunction or wiper noise is VERY obvious.


....... Phil