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Author Topic: GFI's Tripping  (Read 4094 times)

Jean-Pierre Coetzee

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Re: GFI's Tripping
« Reply #20 on: November 02, 2017, 04:34:38 am »

I'll point out that this may not be an accurate test. If there is leakage, and the equipment is interconnected with other equipment or if the chassis is grounded by other means (such as being in contact with structural steel), then some of the leakage current may find a path to ground other than through the equipment grounding conductor.

For an accurate test, disconnect any audio leads from the equipment and insulate the device from incidental grounding.

(Leakage is a common source of "ground loop hum.")
I believe this is what Mike implied.

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Mike Sokol

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Re: GFI's Tripping
« Reply #21 on: November 02, 2017, 08:31:02 am »

I believe this is what Mike implied.

Yes, do this on the bench disconnected from all other gear. That's the only way to get an accurate reading. Another aspect of this to consider is that some brand GFCI's may be more sensitive to high-frequency ground leakage from switching power supplies. A standard meter won't be able to measure those high-frequency currents, but any good o'scope measuring across a series resistor should be able to discover that sort of leakage.
Mike Sokol
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