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Detecting HV transients

Discussion in 'Electronic Design' started by Paul Burridge, Dec 29, 2004.

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  1. HI all,

    What's the best way to check for the presence on a signal line of high
    voltage transients? I can't readily think of an instrument that would
    fit the bill. :-|
    Talkin' 'bout maybe a couple of thousand (high impedance) volts at
    <10ns or thereabouts.

    ta,

    p
     
  2. John Larkin

    John Larkin Guest

    Digital oscilloscope?

    Such a signal rarely exists on a "signal line". A 10 ns pulse will see
    the characteristic impedance of any but a very short line, and its
    impedance will be a couple of hundred ohms max. Nature conspires
    against fast, high-impedance signals. The practical upshot is that you
    don't need a very hi-z probe to detect fast stuff, and it takes a lot
    of current to put kilovolts into anything fast.

    John
     
  3. Guest

    A neon bulb, NE-2 type, and a 80-100 volt low current supply
    (battery?).

    Put the bulb across the supply. If the bulb lights up, reduce the
    voltage supply until it's just below that point. Place the bulb so
    that the glass touches the signal line. Just the glass, no other part
    of the bulb circuit.

    When the HV pulse comes along it will ionize the neon gas and the
    bulb will light and stay lit even after the pulse goes away if the
    bulb's supply voltage is set properly.

    That way you don't have to sit and watch the thing. If you come
    back to it and the light's on, you no a transient happened.

    Jim
     
  4. Marc H.Popek

    Marc H.Popek Guest

    non contact em field measurements, rogowski coil or differential B/E dot....

    Marco
     
  5. James Meyer

    James Meyer Guest

    Or biased neon bulb.

    Jim
     
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