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Super resistors?

Discussion in 'Electronic Repair' started by Lockergnome1, May 4, 2005.

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  1. Lockergnome1

    Lockergnome1 Guest

    In trying to test the laser power supplies I mentioned in an earlier
    post, I dug out my HV's a Heathkit, inherited from my great
    grandpa. It didn't appear to be funcioning, so I disassembled it...In
    the probe end, I found 2 large resistors, constructed of some material
    printed in a spiral around a ceramic cylinder. Both were cracked at
    one end (where they were screwed to the pobe tip and the rest of the
    meter...possibly someone screwed the unit together with too much
    force.) One was labelled as 800 megaohm (!!!) made by Beman Mfg. Inc,
    Component Division. The other is unlabelled. Does anyone know where I
    could obtain replacements, or what I could use instead (other than
    1,600 1-megaohm resistors )
  2. Ken

    Ken Guest

    You might find it easier to buy a new HV probe. They are not all that
    costly if I recall correctly.
  3. Gerard Bok

    Gerard Bok Guest

    The cheap ones can be very costly :)
  4. Ken

    Ken Guest

  5. Guest

    800 2 megohm resistors.

    Seriously... Mouser (and I _think_ Digi-Key) carries Ohmite "Mini-Mox"
    (normal resistor shape) and "Slim-Mox" (flat plate) high value resistors.
    A 750 M, 5 kV, 1 W resistor is $6 quantity 1 and is about 0.9 inches
    long by 0.17 inches around. They don't list an 800 M part - perhaps
    you could adjust the meter calibration to compensate.

    There are a few Heathkit schematic sites around if you need to find
    a value on the unmarked resistor.

    Matt Roberds
  6. NSM

    NSM Guest

    15M Ohm 1/4W, Pkg/100 1.62 EA
  7. jenjhall

    jenjhall Guest

    Those cylinders btw are the little electrostatic generators that ar
    inside of electrostatic paint guns (for one thing). The one I have i
    in a Graco AS 4000 and is labelled 500 megaohms. Since this is stati
    electricity the ohms ala voltage gets very high. Hope this helps. -
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