Date: Sun, 6 May 2018 15:52:19 +0700
From: Martin Sole <hs0zed@gmail.com>
To: amps@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
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