[Amps] Alpha 77 multimeter values

[Jim Thomson]

Date: Sun, 6 May 2018 15:52:19 +0700
From: Martin Sole <hs0zed at gmail.com>
To: amps at contesting.com
Subject: [Amps] Alpha 77 multimeter values

<Hi,

<Anyone have the scoop on the 1mA meter movement used in the Alpha 77. 
<Just want to understand the internal resistance, without having to pull 
<mine apart, again!

<There has been some suggestion that its likely around a couple of 
<hundred ohms though I suspect it should be more like 1200 ohms. My 77 
<manual(s) all show a 1k multiplier measure the volts dropped across a 
<4.7 ohm resistor. At 500mA full scale that's around 2.35v which with a 
<1mA movement needs a total of er, 2.35k. So whats the skivvy on this then?

<Martin, HS0ZED

##  Most  1 ma  meters  are typ  50 ohms if I recall  correctly.
Measure it with a fluke 87-A.      I have a  1 ma installed in one of my
new hb amps.  I can easily measure it..just out of interest. 
I use it to measure  0-10 kvdc. 

Jim  VE7RF