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Reply-To: "fred bartoli"
From: "fred bartoli"
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> <3DDADEBB.2AB8@Spam.Bots>
Subject: Re: Meter movements
Date: Wed, 20 Nov 2002 11:34:31 +0100
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
Organization: Guest of ProXad - France
NNTP-Posting-Date: 20 Nov 2002 11:31:45 MET
Mike Monett a écrit dans le message :
> 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
> > > but even the largest cap I could find in my junk box provided little
> > > 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.
> > [snip]
> > 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.
There's the modern MEMS mirrors projection display version.
You could fed your HP3456 measure to such a display and have it projected in
1mx2m just in front of you lab bench.
They are not as responsive as 100 microseconds but milliseconds should be
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