Super resistors?

Question

In trying to test the laser power supplies I mentioned in an earlier post, I dug out my HV meter...it'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 )

Ken · Accepted Answer

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

Gerard Bok · Answer

The cheap ones can be very costly :-)-- Kind regards,Gerard Bok

Ken · Answer

I did a search for probes, and you are right.  The prices are much higher than I paid when I purchased mine years ago.  But he might look at Ebay.

mroberds · Answer

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 incheslong by 0.17 inches around.  They don't list an 800 M part - perhapsyou could adjust the meter calibration to compensate.There are a few Heathkit schematic sites around if you need to finda value on the unmarked resistor.Matt Roberds

NSM · Answer

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

jenjhall · Answer

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

Super resistors?

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