RE: Field Mills (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 9 Jul 2004 18:25:35 +1000
From: Tom Luttrell PWRCOM <tom@xxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: RE: Field Mills (fwd)

Having an alarm o/p for a (user) set field strength would be a good idea
too.
The ones I've seen installed in Malaysia to warn School kiddies to get
inside worked that way.



> -----Original Message-----
> From: High Voltage list [mailto:hvlist@xxxxxxxxxx]
> Sent: Friday, 9 July 2004 14:33
> To: hvlist@xxxxxxxxxx
> Subject: Field Mills (fwd)
>
> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 07 Jul 2004 21:16:34 +0930
> From: Matthew Smith <matt@xxxxxxxxxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Field Mills
>
> Hi All
>
> I've had another look at the Scientific American field mill
> schematic.  I've got
> samples of appropriate opamps ordered from National and TI.
> Being a digital
> guy, I'm going to feed the output into an Atmel AT90S8515 or AT90S8535
> microcontroller so that I can get RS232 out.
>
> I'll probably do this as two boards, so that I've got a
> universal analogue to
> RS232 module which I can pop onto other front ends.  I still
> fancy the idea of a
> digital "grid dip" meter for finding the resonant frequency
> of Tesla coils, and
> this module could be part of it.
>
> The field mill board will be pretty much as described in the
> article, with part
> substitution at the front end.  (The part specified is
> equivalent to an old
> Burr-Brown chip; I'm using a more modern replacement.)  I'm
> looking at replacing
> the range resistors with something that can be controlled
> electronically (by the
> microcontroller).
>
> Software wise, commands to the microcontroller could be:
> * motor on/off
> * range select
> * select sample period
>
> My idea is that, once running, the uC will send a value up
> the wire every
> second, or whatever interval you choose.
>
> Cheers
>
> M
>
> --
> Matthew Smith
> Kadina Business Consultancy
> South Australia
>
>
>
>