Scott Dorsey wrote:
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Catastrophic ringing: http://www.panix.com/~kludge/xformers/DSC00258.JPG
Any idea what the catastrophic ringing harmonics would look like on a spectrum
analyzer.
They aren't harmonics!
** The ringing frequency is excited by *one* of the harmonics in the square wave.
Can be the fundamental too.
So on a spectrum analyzer that would likely be one single narrow spike.
** Now, the input is a square wave with odd numbered harmonics.
Plus resonances *cannot * create any new frequencies !!!
So the effect on an analyser display is that *one* harmonics is boosted.
....... Phil