[Amps] Panel Meter Article, QST

[Jeff Carter]

Hi again, Scott,

I'm sure everybody has their own method, but here's what I do:

I take a variable power supply and a handful of known-good,
known-value resistors.  Starting with the highest value (say 10K
Ohms), I hook the meter up in series with the power supply and
resistor.

Turning the voltage up *slowly*, I try to dead-center the full-deflection value.

Then, it's an Ohms Law problem.  Say the power supply gives 5VDC at
full meter deflection, and your resistor was a 10k.  5VDC/10K ohms
gives 500 microamps, which is your meter's full deflection value.

Good luck!

Jeff/KD4RBG
http://www.kd4rbg.com

---- Original message ----
>Date: Wed, 4 Mar 2009 19:14:59 -0600
>From: KBØNLY <kb0nly at mchsi.com>
>Subject: [Amps] Panel Meter Article, QST
>To: <amps at contesting.com>
>
>While not strictly amp related i figured someone on here would know, there was an article in QST a while back showing how to determine the full scale value of an unknown analog meter, i can't find that searching the members only part of the ARRL website but i know its there somewhere.
>
>Anyone know??
>
>While working on my recent amp project i unearthed a few unknown meters from my junkbox and i would like to check their function and value.
>
>73,
>
>Scott KBØNLY