Re: Electrometer design? (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 5 Jul 2004 08:50:08 +1200
From: Malcolm Watts <m.j.watts@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Electrometer design? (fwd)

Hi Antonio,

On 2 Jul 2004, at 22:29, High Voltage list wrote:

> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Fri, 02 Jul 2004 20:47:40 -0300
> From: Antonio Carlos M. de Queiroz <acmdq@xxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Electrometer design? (fwd)
>
> High Voltage list wrote:
>
> > Lots of links at the bottom of this page:
> >
> > http://www.voltnet.com/lightning_atmos/experiments.shtml
>
> The field mills are very nice devices.
> I have two broken field mills, made by the Phywe company
> (Electrofeldmeter, model 11500.10) that are waiting repair.
> Would someone have the schematics of the internal board?
> The problem is with the electronics inside, quite complicated.
>
> Antonio Carlos M. de Queiroz

I am currently examining a design which appeared in the July 1999
Amateur Scientist section of Scientific American with a view to
building several. The circuit is basically a transconductance amp
which amplifies tiny currents which are then converted to a voltage,
rectified and peak detected. I suggest having a look at that design
and possibly throwing away the current set of electronics if it is
too difficult to repair (I suspect it isn't ;)

Malcolm