Greetings All:

I uncovered two ancient RF Thermo Couple Meters this evening, I had put them
away some years ago in anticipation that at some point I might want to
measure RF amps.  They are identical, made in 1940, Ref No. 10A/8479.  Full
scale 2.5 amperes, noted "for Radio Frequency Only".  They are of what I
would call "light construction" not the heavy duty construction that one
associates with the better products made for WW II.

How might I calibrate them?  I have some excellent calibrated resistors but
they are in general a little small to get a couple of amps into them without
some residual damage.   Is some 60 Hz a little to low "for Radio Frequency
Only"?  If anyone has a simple process I would appreciate hearing about it.

Thanks in advance.

Larry
VA3LK