They will read high in a non-ferrous panel, as the magnetic shunt around the
poles of the
stationary parts of the movement magnetic circuit provided by the steel panel
will be absent.
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: "Vic K2VCO" <vic@rakefet.com>
To: "Bill Turner" <dezrat1242@ispwest.com>; "Amps reflector"
<amps@contesting.com>
Sent: Wednesday, December 28, 2005 9:28 PM
Subject: Re: [Amps] Calibrate a panel meter?
> Bill Turner wrote:
>
> > 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.
>
> Most older or surplus meters were calibrated for a steel panel. When
> you use them on an aluminum panel, they read wrong....I *think* they
> read low in a non-ferrous panel, but I can't swear to it (someone else
> will know).
>
> If that's the case you might be able to improve the accuracy by cutting
> out a steel ring (O.D. maybe 1/2" or more than the I.D.) and putting it
> around the meter in back of the aluminum panel.
>
> Just a thought.
> --
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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