Re: high voltage probes

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Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


You can sample the discharge with a simple "air antenna" about 10 ft. away.

Or, you can use two old variac cores.  Strip some RG8U coax so only the
inner conductor and plastic insulation remains.  Wrap 50 turns of the coax
around one core and extend over to the second core and wrap another 50 turns
around it.  You plug the first variac into an AC outlet and the second
variac feeds your scope.  This is good for around 75 kV isolation from
ground.  This works well with MMC type Marx generators but I would not risk
a storage scope with a high power Marx generator.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, September 28, 2003 12:01 PM
Subject: high voltage probes


 > Original poster: Mark Broker <mbroker-at-thegeekgroup-dot-org>
 >
 > I have a desire to hook our small Marx Generator up to an oscilloscope to
 > view the waveform across the rectifier during the discharge event.  A
while
 > back we overvolted a 32kV rectifier we were using at "low voltage" with
 > only a little over 10kV cap charge.  In theory, only 20kVmax should have
 > existed across the rectifier.  I don't want a similar event with the final
 > 55kV rectifier when we run it at full voltage off a 15/30 NST.
 >
 > I was thinking of just making a 1000:1 resistive divider, which would work
 > for low frequency/DC, but I don't know how well that would work with the
 > MHz hash in the discharge.  Any opinions from the crowd?  I don't expect
 > the need to measure more than 25kV.
 >
 > Thanks!
 >
 > Mark Broker
 > Chief Engineer, The Geek Group
 >
 >
 >