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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
    AC?
     
  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.
    --
    Regards,

    Chas.

    (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)
    http://cgi.ebay.co.uk/DIGITAL-AC-DC-CLAMP-MULTIMETER-AUTOMOTIVE-BATTERY-METE
    R_W0QQitemZ400037674266QQihZ027QQcategoryZ294QQssPageNameZWDVWQQrdZ1QQcmdZVi
    ewItem
    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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