Quote:
Originally Posted by rick-l
Hmmmmm What does this mean?
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If I haven't lost all of my marbles, that should refer to the response time of the probe, or, in other words, how fast of a signal you should be able to resolve (see).
If you take the reciprocal of the 20 kHz, you'd get 0.00005 or 50 micro-seconds (50 µs). If the signal is occurring faster than this, your probe won't be able to see it and neither will you.
by the way, in the blue waveform of post #6, you can see roughly 2 peaks every 1 millisecond, or 1 peak every 500 µs. Chances are, hopefully, the response time of this setup is much better than 1 / 500 µs ( or, the 2kHz) waveform displayed.
Sorry I walked away from this thread for a few days.
As dick pointed out, the waveform will give clues as to the motor health (like the condition of the armature contacts for example). This stuff is related to a whole section of electrical eng'rng devoted to motors/theory that not many career guys ever get involved with. But the answer to his question is out there somewhere.
I hope someone can continue this - it'd be cool.