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ground neutral tester

Discussion in 'Misc Electronics' started by gink, Feb 16, 2006.

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  1. gink

    gink Guest

    I recently acquired an Instrutek GN-3 ground neutral tester. It
    appears to work, but I don't know what its operating principle is.
    Inside is a pc board, about 3 inches square, with one ic and various
    components. An analogue meter on the front, with a reference adjust
    pot, a ground or neutral select toggle and a push button. It doesn't
    use probes, apparently getting all information from its power plug.

    Does anyone know how it operates? Any information gratefully received.
    Instrutek did not reply.

    thanks, gink
  2. The neutral is at ground potential but normally carries current. The ground
    only carries current in the case of a fault. Perhaps it senses the voltage
    difference between the two or the impedance difference?
  3. That's a ground fault circuit interrupter (GFCI). You could be right in
    that that was what the OP was describing.
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