Date: Sun Mar 29 15:05:57 2009 Back to Contents ------------------------------------------------------------------------

Author: Simcha Segev

Subject: Re: Electrostatic analog voltmeter

Post:

Dear Urs, Sunday is a regular working day in Israel but in the rest of the
western world....it seems that you are a freak like most of us...

Thanks for the link. however I insist to find those kind of ANALOG
voltmeters and not the modern one. I already asked GOSSEN for a solution and
I'm waiting for their answer.

Anyway, we are getting ready for the two weeks Passover vacation and
meanwhile we enjoy the sunny days in Israel.

Greetings, Simcha

P.s. have you any plans for the summer meeting?



-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Urs Lauterburg
Sent: Sunday, March 29, 2009 2:40 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Electrostatic analog voltmeter

Simcha,

These fine devices are very rare by now and that's why I guard my fine,
large, antique analog electrostatic voltmeter for 0-5kV from Gossen like a
treasure. It's still in very good shape and does the job well.

What you may could do is to use an OpAmp with a high input resistance as an
integrator with a feedback capacitor to hold the charge and drive a normal
voltmeter with it. Of course calibration to absolute units may be a bit
tricky and less obvious than with a direct measurement of the mechanical
displacement of two charged plates as is done within the old fashioned
static voltmeters.

Some manufacturers offer instruments to measure static electricity the
''modern'' way e.g.:

http://www.smcworld.com/2002/npp/npp_view_e.php3?&KeyNo=NPP-06-6

Don't know about their performance/accuracy though.

Regards from pretty nearby

Urs

Urs Lauterburg
Physics demonstrator (not banker)
Physikalisches Institut
University of Bern
Switzerland


>Hi Taplers,
>
>I'm looking for Electrostatic analog voltmeter for 1,3,6 and 10Kv or
>more (similar to the GOSSEN panel voltmeters 144x144 sold few years ago
>by
>Leybold-Didactic) for our new lobby display that I'm working on.
>
>I already have few electrostatic meters manufactured by GOSSEN and
>would like to buy more. Any suggestions will be appreciate.
>
>
>Thanks, Simcha


From tap-l-owner@lists.ncsu.edu Sun Mar 29 15:05:57 2009

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