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Measuring Interference

Discussion in 'Electronic Design' started by Steve Minshull, Nov 13, 2003.

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  1. I'm trying to pick up interference/changes in magnetic field around a
    conductor. The conductor carries 30kV pulses of 3-4mS duration and max
    frequency of around 10Hz. Doing some tests with a scope lead, with the
    gound connector connected to the probe tip to form a small loop, I picked up
    voltages around 30V peak when in close proximity to the wire. What I want
    to do is to take this signal, rectify it, smooth it a bit, clamp it to 5V
    then use it to trigger a microcontroller. What is the best way of doing
    this? How do I model the loop of wire? Would it be a voltage source in
    series with a large resistance?

    I've looked at simple diode, resistor, cap rectifiers but the component
    values depend on the effective series resistance of the loop pickup.

    Cheers in advance for any advice

    Steve Minshull
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