Thread: Discussion H-bridge motor controller
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Old Apr 05, 2012, 03:01 PM
jeffs555 is offline
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"Simplify, then add lightness"
Joined Nov 2000
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Unless the common mode voltage is a lot higher than the differential voltage, the two probe add invert method works essentially the same as a differential probe.

The only reason I asked about differential is that connecting the probe ground clip to points other than ground can affect the circuit. Not usually a problem if the circuit is low frequency, battery powered and totally isolated from ground and you only need to measure one signal at a time. That seems to be the case here, but since I didn't know exacty where how you were measuring, had to ask. Always have to be careful that the measuring equipment is not changing the operation of the circuit.
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