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High Voltage Test Equipment
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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Thursday, March 05, 1998 11:57 PM
To: Tesla List
Subject: Re: High Voltage Test Equipment
Hi Jim,
> From: Homer Lea [SMTP:HomerLea-at-aol-dot-com]
> Sent: Thursday, March 05, 1998 2:05 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: High Voltage Test Equipment
>
> In a message dated 98-03-05 00:46:30 EST, you write:
>
> > From: terryf-at-verinet-dot-com [SMTP:terryf-at-verinet-dot-com]
> > Sent: Wednesday, March 04, 1998 5:22 PM
> > To: Tesla List
> > Subject: Re: High Voltage Test Equipment
> >
> > Jim,
> > Having just gone through the HV voltage divider design zoo with my
> > equipment, I have one caution. At 60Hz the long string of resistors will
> > work fine. However, if you wan't to measure voltage waveforms at say
> 200KHz
> > the frequency response will be bad. I am now persuing vacuum molded epoxy
> > encapsulation to get small size, reasonable power dissipation, and high
> > frequency response. Your oil bath should do the same just a little more
> > "fluid" :-) Do try to make it very compact.
> >
> > Terry
> >
> Terry:
> I just sent off new specs:
> -------------
> post script: I ended up getting 400 15meg resistors. They are small (1/8)
> watt. My plan is to string them in series, put them in a Tygon tube and fill
> with oil. I will coil up the tube so it isn't 20 feet long. I assume the
> inductive reactance will be zilch compared to the 6 billion ohms of resistors
> The resistors will be in series with a 50 or 100 ua meter connected through a
> full wave rectifier bridge. Does anyone know how much voltage I can put across
> each resistor?? I am hoping for at least 500 v each and dreaming of 1000 v.
> ------------------
> A 20 foot tube it not small, even coiled up. Is that going to screw me up? My
> original thought was simply to measure the output voltage of coils rather than
> wave forms.
> jim heagy
I agree with Antonio. you will have to add compensation capacitors to
a string like that because of shunt capacitances. I had to do exactly
this in a much smaller HV probe.
Malcolm