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Finding a Break in an Electronic Fence

Discussion in 'Electrical Engineering' started by JimO, Dec 4, 2004.

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  1. JimO

    JimO Guest

    I have an electronic fence for my dog which worked perfectly for several
    years. There appears to be a break in the wire that goes arround my yard.
    Can someone tell me how to find the break.
  2. John Gilmer

    John Gilmer Guest

    No problem.

    Just use a variation of the method the electric utility workers use to find
    breaks in the underground service.

    You "power up" the loop and use your high impedance DVOM to look for voltage
    gradients. If you DVOM can't measure the frequency produced by the
    "electronic fence" then replace that with a door bell transformer for the
    duration of the test. Stick your two probes into the ground a few feed
    across and keep doing this along the suspected route of the wire. You
    should measure a voltage equivalent to several percent of the driving
    voltage when you get near the break. Then move the probes one at a time in
    a place that gives the maximum voltage. You will be right on top of the
    break. You might want to put a bulb in series with the transformer drive
    just in case the wires re-establish contact while you are messing about.
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