[R-390] Meters

[Barry]

> Hello to every one.Is there a safe way to fix meters that do not return to 
> zero

I just finished working on a Triplet panel meter (220-G series) that was 
sticking at around the 2/3 scale position.  I removed the pivots and cleaned 
them, but that wasn't the problem.  It turned out to be a tiny bit of 
magnetic trash that had gotten in the space between the barrel and magnet. 
It was pretty difficult to clean properly and I didn't get it all out, but I 
got enough of it so that it doesn't stick anymore.  I used a small strip of 
paper and passed it in the air-gap several times before I could get it all 
cleaned out.  It doesn't take much to disrupt the operation of the meter and 
you pretty much have to look in the gap with an eye-loupe to see it well.

Trash in that location might be what's preventing your meter from zeroing 
properly, but there's probably a host of other things that might account for 
it as well.

If yours is one of the "glow-in-the-dark" variety, then I'd not recommend 
any cleaning like this or even disassembling it at all.  You'd likely 
dislodge trace amounts of radium-covered dust, etc., and you wouldn't want 
to ingest any of that.

Good luck with it,

Barry - N4BUQ