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Clamp metesr and DC current

Discussion in 'Hobby Electronics' started by MoiInAust, Mar 18, 2009.

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  1. MoiInAust

    MoiInAust Guest

    Can clamp meters measure DC current using the clamp(as round a car battery
    lead)? If so, how do they work? Surely they need a varying current, as in
  2. Franc Zabkar

    Franc Zabkar Guest

  3. Chas

    Chas Guest

    IIRC, before the advent of solid state electronics, they consisted of a
    pivoted permanent magnet which aligned itself with the magnetic field around
    the cable. This was spring loaded and was linked to the pointer. A cable
    groove was included in the rear of the meter, which was placed in contact
    with the cable insulation to take a reading.


    (To email me, replace "xxx" with letters tango papa golf.)
  4. john jardine

    john jardine Guest

    They use a 'Hall effect' sensor built into the clamp. Can do AC and DC.
    Bought one of these last year ... (beware of line break)
    Really weird to be able to clip on and see the direction of charging current
    into a battery, or how much current some circuitry is taking.
  5. David

    David Guest

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