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Phase Comparator

Discussion in 'Electrical Engineering' started by BIGEYE, Apr 15, 2008.

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    BIGEYE Guest

    When cleaning out an old shed/workshop, I came across a phase comparator
    made by Pfisterer.
    This is a hand held unit and may be for use on HV systems judging by the
    look of the leads and looks hardly used.
    Could anyone tell me what these instruments are for and what the value might

  2. Don Kelly

    Don Kelly Guest

  3. krw

    krw Guest

    Thirty years ago I was asked to update a phase-rotation sensor for
    mainframes (their phase-controlled power supplies didn't like to be
    plugged in backwards and backwards blowers didn't work well ;).
    LEDs don't work so well in this application. They use a lot of
    current at a low voltage (low impedance), thus load/upset a phase
    delay circuit. The answer was a 'D' flipflop on a bridge between
    the phases. That was sensitive to zero-crossing distortion, but a
    solvable problem.
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