Electronics > Beginners

Can you help to explain this waveform of an idle motor?

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KrudyZ:

--- Quote from: injb on November 12, 2018, 10:38:23 pm ---I'm curious to know why attaching my ground clip to a big metal box that's floating has a similar effect to grounding (in that it turned my signal from gibberish into the right waveform). But next time I'll use a ground pin in the wiring harness anyway.

--- End quote ---

The coil has a certain amount of capacitance to the housing and your scope probe has a high input impedance.
What is happening is that the probe / scope is charging the capacitance to the average value of your AC signal.
For a 50% duty cycle signal that would be half the signal swing and what you are seeing on the scope is relative to that voltage and results in positive and negative excursions on the scope.

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