Re: high voltage probes

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

Original poster: dhmccauley-at-spacecatlighting-dot-com 

     I WOULD STRONGLY RECOMMEND AGAINST USING ANY TYPE OF ELECTRICAL TYPE
TEST EQUIPMENT TO
MEASURE MARX GENERATOR VOLTAGES DURING DISCHARGES unless the equipment and
measuring signal is completely isolated from
the marx generator.  During a discharge, there is huge high voltage
transients present on almost every part of the marx generator including the
grounds.

Dan


 > 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
 >
 >
 >
 >
 >