In Reply to: TEMPORARILY lifted the green wire from chassis posted by Sam P. on March 01, 2003 at 21:08:06:
Something else in the system probably has chassis and signal grounds connected together, perhaps via. a resistance or capacitance. Once you make another connection between chassis and signal ground, there is a possibility of difference in potential. Where there exists a difference in potential, even if slight, a ground loop results and with it comes lots of noise.
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