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

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 23 Sep 2004 07:22:55 -0600
From: Gomez Addams <gomez@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: HV Measurement - A different Divider Problem  (fwd)


On Sep 22, 2004, at 10:35 PM, High Voltage list wrote:

> Original poster: <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.

 From what I've read, this isn't going to be terribly useful above a few 
hundred
kV.

> 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?
>>
>>
>>
>
>
>
...................................
If Quake gamers play with railguns,
what am I building in my garage?