[ARC5] Possible meter for the A-61-A

[Mike Morrow]

Tom wrote:

>After I sent my previous note, I just remembered I found
>two meters recently at the CC-AWA in Charlotte, NC. They
>look alike, but are made by different manufacturers. Either 
>one (or both) might be the correct meter.  But I'm not sure.

No, neither meter you described is the correct RF ampere meter for the A-61-A.  The proper meter is a white-face internal-thermocouple 0 to 4 AMPERES R.F. Weston Model 507 (A.R.C. part number 7781).

BTW, the schematic that Mike Hanz sent to the list shows point 5 and point A.   Those are the push terminals with the same markings on the front panel of the A-61-A.  You can connect a DC source to the 5 terminal and GND and see the meter indicate the amps that result from the voltage of the applied source divided by the 5 ohm internal load resistance.

Mike / KK5F