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From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: Meter movements
References: <3DD47F82.14E8608@videotron.ca> <firstname.lastname@example.org> <3DD6F1BE.4F3C0ED0@earthlink.net> <email@example.com> <3DD7ADF4.2B1E@Spam.Bots> <3DD7C944.7CBC@Spam.Bots> <firstname.lastname@example.org> <3DD8E431.4D57@Spam.Bots> <email@example.com> <firstname.lastname@example.org> <3DD96775.3D27@Spam.Bots> <email@example.com>
Date: Tue, 19 Nov 2002 17:00:43 -0800
NNTP-Posting-Date: Tue, 19 Nov 2002 17:00:45 EST
Organization: Bell Sympatico
Tony Williams wrote:
> In article <3DD96775.3D27@Spam.Bots>,
> Mike Monett wrote:
> > Thanks for the replies! I tried a cap across the movement some time ago,
> > but even the largest cap I could find in my junk box provided little or
> > no damping.
> ISTR using a 100uF or so with a 50uA movement.
I tried a 2200uF with a 150 microamp movement, but ended up using a plain
680 ohm resistor.
> > Probably the best thing would be to consign the RS meters to the back
> > shelf, and work on a 6 1/2 digit wireless voltmeter.
> Forget the technibolds Mike. What you need for those
> tired old eyes of yours is a mirror galvanometer, with
> the scale painted all across one wall of the workshop. :)
> Tony Williams.
Thanks for the excellent suggestion!
I did a search expecting to find mirror galvanometers consigned to the
dustbin of history. Amazingly, they are still very much alive. One
company in Mass. produces various models, one with a small-signal step
response of 100 microseconds and milli arcsecond accuracy. There are many
applications that depend on the unique capability of high scan rate, wide
optical bandwidth and low loss.
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