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Old 07-02-2007, 05:35 PM
sje sje is offline
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Join Date: Nov 2006
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I'd guess that the 60 Hz signal, or any other signal source, should have the same electrical ground as the circuit that's receiving it. There has to be a return path for the electron flow. Without this, it would be like trying to take a measurement with an oscilloscope probe without connecting its ground clip to the test circuit's ground.
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