[Milsurplus] RF Ammeters

[jfor]

> A question about the typical thermocouple
> RF ammeters used in a lot of WWII transmitters.
>
> How accurate are they at 60 to 1000 cycles?
>
>
> Jack

Since they are based on heating effect, they should be pretty good as
long as the periods of the applied waveform is significantly less than
the time constant of the thermal element. Thermal true RMS converters
used to be common.

Be aware that some of them (like those in the ARC-5 and BC-442) have
current transformers in the circuit which are useless at audio
frequencies.

-John