[AMRadio] Thermocouple rf ammeter

Jim Candela jcandela at prodigy.net
Sat Feb 10 14:17:26 EST 2007

----- Original Message ----
From: Jay Rusgrove <JRusgrove at comcast.net>

They can be easily checked if you have a DVM that reads ac amperes. Put the DVM and the rf ammeter
in series with an appropriate sized load (several light bulbs) and plug it in to 120 VAC.


Reply from Jim, WDJKO:


  You can check the accuracy with RMS AC as you said, or DC. It does not matter. The meter movement is always DC from the thermocouple effect. Since many of us have variable 12 volt supplies, it would be relatively easy to use one of these, and a load like a automobile headlamp. Just put it in series with the ammeter, and crank up the voltage. 


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