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Seeking low-current (<10A) clamp-on DC current probe

Discussion in 'Electronic Basics' started by davidd31415, Sep 15, 2005.

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  1. davidd31415

    davidd31415 Guest

    I'm looking for a low-current clamp-on DC current meter to use as a
    current indicator; anything else that might work as a
    current/no-current check device would be great as well. The quicker a
    single check can be performed the better as I'll be checking 30 wires
    on a regular basis.

    I've thought about using LEDs in series but two problems arise. The
    wires will be moved regularly so I would need wires and strain relief
    to ensure the LED legs do not break off and more importantly, the
    voltage across the loads is changed dynamically and is measured inside
    the power supply. Using one load for sensing is not an option in case
    of a single failure and approximating the voltage drop will only be
    okay if all LEDs are guaranteed to be within +/- .1V of each other and
    have a constant voltage drop throughout use at slightly varying room
    temperatures and humidities.
  2. mike

    mike Guest

    Not sure exactly what you're doing, but a compass laid on the wire will
    tell if there's any current in it. You can get one with a "calibrated"
    dial on it at an auto parts store. Or you can pay as much as you desire
    for a non-contact DC current meter.
    I've got a FW Bell CG-100A clamp-on DC current probe I'll sell for $50.
    Needs external voltmeter for readout.

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  3. Jasen Betts

    Jasen Betts Guest

    A regular clamp probe issn't sensitive enough, (I can buy a kitset one
    with 100ma sensitivity) catalogue number 5368, it'd need
    some (but probably not much) modification to drive a LED indicator

    you can put a loop with ten turns in each wire (which will multiply the
    current sensed by the clamp probe by 10 if it's clamped on the loop.

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