Re: Electrometer design (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 15 Jul 2004 10:46:59 -0600
From: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Electrometer design

Years pass I did somyhing similar. At the radar site we had a over head air
duct positioned just high enough to catch your head just above your eyes so
I made a small yaggi antenna and neon lamp to flash a warning to save rour
head. I did not consider the limited intelagence of a 2nd Leutennent who
seeing the flashing light and the radiation warning signs and called the
radiation decontamination clean up team. Funny now but not then. The
milatary lacks a sence of humor.
   Robert    H
-- 


> From: "High Voltage list" <hvlist@xxxxxxxxxx>
> Date: Sun, 11 Jul 2004 22:39:00 -0600 (MDT)
> To: <hvlist@xxxxxxxxxx>
> Subject: Re: Electrometer design (fwd)
> Resent-From: hvlist@xxxxxxxxxx
> Resent-Date: Sun, 11 Jul 2004 22:39:32 -0600
>
> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 11 Jul 2004 12:21:54 -0500
> From: Dr. Resonance <resonance@xxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Electrometer design (fwd)
>
> A round sphere works even better.  We use a 14 inch Van de Graaff terminal.
> The sphere acts like a capacitor, and due to it's larger surface area,
> collects more charge.
>
> Dr. Resonance
>
> Resonance Research Corporation
> E11870 Shadylane Rd.
> Baraboo   WI   53913
>>
>> Charles Brush wrote:
>>> The design is incredibly simple.  Basically you have a little NE2
>>> lamp in parallel with a capacitor with one side attached to ground
>>> and the other to an elevated and sharply pointed rod.  As the local
>>> field increases current will flow through the circuit causing the cap
>>> to charge and periodically discharge through the NE2 causing it to
>>> blink.  The faster it blinks the stronger the field overhead.  I
>>> tried this a few summers ago but I can't remember the cap value I
>>> used (anyone have suggestions?).
>>
>> This design (or one like it) is described in Iannini's "Building your own
>> working fiberoptic infrared and laser space-age projects"  (the book with
> the
>> long-winded name).  The capacitor value is given as 1nF @ 1kV.  Fig 14-12
> on
>> page 238 in my copy.
>>
>> This uses a metal can instead of a pointed rod as a charge collector.
> This sits
>> on a plastic aerosol cap to insulate the can from ground.  NE2 shows
> through a
>> hole in the cap.
>>
>> Cheers
>>
>> M
>>
>> --
>> Matthew Smith
>> Kadina Business Consultancy
>> South Australia
>>
>>
>>
>
>