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Re: [Amps] Calibrate a panel meter?

To: <>, "Bill Turner" <>
Subject: Re: [Amps] Calibrate a panel meter?
From: "k7rdx" <>
Date: Wed, 28 Dec 2005 10:54:12 -0800
List-post: <>
If it`s reading low..Oil it! Tee Hee...Actually you need to take it apart
and adjust the internal shunt...Some of the Weston meters I have seen are
internally shunted with resistance wire...Perhaps Simpson meters do
likewise? Happy New Year..Jim..
----- Original Message ----- 
From: "Bill Turner" <>
To: <>
Sent: Wednesday, December 28, 2005 10:20 AM
Subject: [Amps] Calibrate a panel meter?

> I have a Simpson 923A panel meter, 1 amp full scale. It is reading
> low by about 6%. When it has 800 ma through it, it indicates about
> 750 ma. I'll be using it in my 8877 amp at 800 ma and I'd like it to
> be more accurate.
> If it were reading high, I could just shunt it, but reading low...???
> Is there a way to calibrate it by adjusting anything inside? Moving
> the magnets around, etc? I'm sure the factory calibrates them somehow
> but I've never read anything in the ham literature about how to do it.
> Suggestions appreciated.
> 73, Bill W6WRT
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