In article , "Ian White, G3SEK"
writes:

Is there a standard RF input level per "S" Unit?

If so, please post the location. Thanks.

There is an IARU recommendation, which originated in Region1
(Europe/Africa) and I believe has been adopted by IARU world-wide.

Thanks, Ian, and thanks to all others responding. A plus to Reg
Edwards for mentioning the U.S. military receiver specs which
I was hunting around for but could not find. :-(

Reason for asking is that I'm going to make a meter scale for a
little receiver a-building, using (nobody blanch, please) MS
Paint from a scanner (accurate 1:1) digitization of the removed
meter scale plate. I've done that with a normal-expanded scale
meter on a 120 W variable autotransformer box used on the
bench. MS Paint will do color in 256-color mode for a better
appearance. An inkjet printout on heavy photo paper stock
results in a fine-grain scale sturdy enough to replace the stock
plate in a little 2 1/2" microammeter.

Note: That works only on the old-style meters with removeable
scale plates (screw mounting type). Newer snap-together plastic
case types aren't recommended for that.

That method started on wondering how accurate an ordinary
scanner was...solved by scanning a 6-inch metal scale, printing
it, then comparing the real scale to the printout. By eyeball it
was dead-on! :-) I've done that for drill guides on PC board
stock used for both circuit boards and small enclosures since
and find it very time-economical. Machine shop accurate it isn't
but then my home shop drill locations were never that accurate
using scribe marks on "dye-chem" blue lacquer painted on
aluminum. :-) [rubber cement holds the paper printout on the
work, removes easily afterwards]