RE: high voltage resistors

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>



Actually, wirewound resistors are the worse possible resistors to use for HV
Pulse duty applications.  The inductance
in the resistor is much too high.

Dan




Wirewound resistors are normally fairly good for HV, but they have a sort of
spectacular failure mode (now how would I know that?!) where an arc burns
back along the wire....

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, January 20, 2003 7:56 PM
Subject: high voltage resistors


  > Original poster: "Mark Broker by way of Terry Fritz
<teslalist-at-qwest-dot-net>"
<mbroker-at-thegeekgroup-dot-org>
  >
  > Hello, all!
  >
  > I'm looking for some inexpensive resistors that will stand off 20kV
  > pulses.  I have
  > no objections to using two or three in series.  I need a value of
  > 30-40kohm.  I am
  > currently using 3 1/2W resistors in series, but question the longterm
standoff
  > ability.  I have been considering the Ohmite OY series - 2W ceramic
  > composition
  > that are about .75" long and .3"diameter, available from Digikey.  But at
  > about a
  > buck each, I'd rather not spend $40 to discover they won't work!
  >
  > Thanks,
  >
  > Mark Broker
  > Chief Engineer, The Geek Group
  >
  >