[R-390] Meter Question
Barry
n4buq at aol.com
Tue Jul 19 11:47:36 EDT 2005
That's about what I figured. I bought some meters from Leeds Electric that
are 100uA full-scale and around 1K. I was hoping these might be different,
but probably not. Nice meters if they fit the application, but I can pass
on these.
Thanks!
Barry - N4BUQ
----- Original Message -----
From: "Mark Donaldson" <wa1qhq at yahoo.com>
To: "Barry" <N4BUQ at aol.com>; "R-390-List" <R-390 at mailman.qth.net>
Sent: Tuesday, July 19, 2005 7:56 AM
Subject: Re: [R-390] Meter Question
> Barry,
>
> I have already bought some of those meters from ATC
> and the internal resistence is somewhere North of 1K
> Ohm which means shunting will give you an internal
> resistance arount 100 Ohms which is if memory serves
> me about 10 times higher than what you want.
>
> --- Barry <N4BUQ at aol.com> wrote:
>
> > Gents,
> >
> > The gentleman selling these sent me one with the
> > front glass broken. After
> > receiving it, I realized it may be a
> > "glow-in-the-dark" meter and could be
> > hazardous. It was sealed in a plastic bag and I put
> > it in a glass jar with
> > a tightly-fitting lid until I figure out what I'm
> > going to do with it.
> >
> >
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5717004917
> >
> > I bought it because I wanted to measure the internal
> > resistance in hopes
> > that it might work as an R390A replacement. The
> > meter movement is fs=100uA
> > so it would require some shunting at the very least;
> > however, if the needle
> > is painted with radium-based paint, then I don't
> > want to fool with it.
> >
> > Is anyone familiar with these and know if they are
> > hazardous? It has a
> > "SEALED DO NOT OPEN" stamp and I thought that might
> > be one clue that it
> > might be a problem.
> >
> > Yeah, I know the threat is minimal and as long as I
> > don't lick the insides,
> > I'll probably be okay, but I just really don't want
> > to take the chance.
> >
> > Thanks!
> >
> > Barry - N4BUQ
> >
> >
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