Re: HV Measurement - A different Divider Problem (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 22 Sep 2004 17:28:37 -0500
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: HV Measurement - A different Divider Problem  (fwd)


You can also use a simple spark gap with 10 cm spheres.  This works to find
peak voltage because the peak potential is completely independent of the
frequency of the waveform.

Use a string of resistors (5-10 meg) in series with some HV diodes) in the
primary circuit between xmfr and caps.  This will charge you caps and fire
every 5-10 seconds a single pulse.  If using an RSG, just line the
electrodes up and leave it off.

Dr. Resonance

>
> ---------- Forwarded message ----------
> Date: Wed, 22 Sep 2004 09:32:20 -0600
> From: Gomez Addams <gomez@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: HV Measurement - A different Divider Problem
>
> I already have a Fluke 40VDC / 8KVAC HV divider probe.
>
>   For years, I've toyed with the idea of building a divider for much,
> much higher voltages and much lower currents, for example, directly
> measuring the voltage of a Van de Graaff or maybe even a Tesla coil!
>
>   I know the issues are non-trivial.
>
>   To that end, I've acquired a dozen or so 9900 Megohm carbon film
> resistors, about 6" long each.  The film is spiral wound, and the
> diameter of the resistors is about 1/2", so they are clearly inductive.
>   Might present a limited bandwidth. I might have to give up on the idea
> of measuring RF voltages, but that's okay.
>
>   Has anyone built a divider specifically intended for direct
> measurement of very low current, very high voltage, high frequency
> voltage?
>
>   I know about field mill generators and field antennas like Terry uses,
> but that's a solved problem, I'm trying to do something different just
> because it's different.  :)
>
>   - Bill "Gomez" Lemieux,
> Denver, Colorado
>
> ....................
> What Would Tesla Do?
>
>
>