The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Reply-To: "fred bartoli"
From: "fred bartoli"
References: <3DD47F82.14E8608@videotron.ca> <email@example.com> <3DD6F1BE.4F3C0ED0@earthlink.net> <firstname.lastname@example.org> <3DD7ADF4.2B1E@Spam.Bots> <3DD7C944.7CBC@Spam.Bots> <email@example.com> <3DD8E431.4D57@Spam.Bots> <firstname.lastname@example.org> <email@example.com> <3DD96775.3D27@Spam.Bots> <firstname.lastname@example.org> <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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup