[AMRadio] Meter Sticking SB-220


Greg Schultz Sr w5ry at cox.net
Tue Mar 6 09:15:04 EST 2007


Thanks Jim.  One more question.  I have a spare multimeter.  How can I
test it to see if it is good before installing.  My first thought is to
check with an ohm meter, but I wonder if I would damage it by passing
too much current and pegging the meter.  Any tip on a quick way to test
it.

Greg W5RY



-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim Wilhite
Sent: Monday, March 05, 2007 9:49 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Meter Sticking SB-220

Greg:

Try removing the meter and carefully take the face off. 
Look between the coil and surrounding core for bits of metal 
or debris that should not be there.

If there is anything, you should be very careful here, 
remove the debris and reassemble the meter.  Do not use 
compressed air or anything that will cause the meter to peg 
hard, for it could bend the needle.  If it is metal, you 
will have a tough time getting it out since the magnet will 
hold it in place.

Good luck.

If that doesn't work, there are meter shops that will 
perform the service for you.  Maybe near where you live.  If 
you don't feel confident to do this, then check with any big 
airport for avionics repair shops then ask them about meter 
repair shops.  Many shops that repair Simpson 260 can do 
this easily.  If you are steady enough, study the meter 
movement and disassemble it for cleaning then reassemble. 
This requires the patience and steady hand of a watch maker 
which is another place that might be able to help.

73  Jim
W5JO

----- Original Message ----- 
From: "Greg Schultz Sr" <w5ry at cox.net>
To: <AMRadio at mailman.qth.net>
Sent: Monday, March 05, 2007 9:29 PM
Subject: [AMRadio] Meter Sticking SB-220


>I have the multimeter on my amp(sb-220)that sticks above 
>zero.  I tried
> adjusting the zero on the face but could not get it to 
> zero.  I remember
> reading some time back several emails on this topic.  Can 
> anyone suggest
> a fix other than replacing - these meters are very hard to 
> locate.
>
> Thanks for any help
>
> Greg W5RY
>
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