Re: Electrometer insulators (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 1 Nov 2006 13:47:21 +1300
From: m.j.watts@xxxxxxxxxxxx
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Electrometer insulators (fwd)

Hi Dave,

On 30 Oct 2006, at 14:20, High Voltage list wrote:

> Original poster: Steven Roys <sroys@xxxxxxxxxx>
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Mon, 30 Oct 2006 9:11:32 -0800
> From: David Dameron <ddameron@xxxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Electrometer insulators
> 
> 
> Does anyone know of a web page with characteristics of insulators suitable 
> for electrometer work? I am investigating an experiment with a metal box which 
> would hold gel-cell batteries, a motor, rotating magnets, etc. The charge which 
> could be induced on the box is in the range of
> 
> 10E-14 Coulomb. This metal box would be enclosed in and insulated from an 
> Faraday cage.
> 
> One candidate is polystyrene, say 4 columns 10cm long. I know teflon is 
> good for small printed-circuit use, but do not know how it would perform in this 
> type of use. The insulator should not be too much piezoelectric, with 
> likely vibrations from the rotating elements.
> 
> -Dave D.

Can you give a pointer to a diagram of your proposed setup? Rotating magnets 
inside a metal box sounds like a recipe for inducing eddy currents.

Malcolm