I always believed that you could calibrate true bolometric RF ammeters using
DC? I've checked a couple of thermocouple RF ammeters and it seems to work.
Martin Evans
Mollie's Loft bookshop
96 High Street
Clydach
Swansea SA6 5LN
Tel 01792 842135
radio@emart.freeserve.co.uk
----- Original Message -----
From: Larry Kayser <kayser@sympatico.ca>
To: <rsgb_lf_group@blacksheep.org>
Sent: 06 May 2000 02:56
Subject: LF: RF Thermo Couple Meter, calibration?
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
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