In message
<B5113F712514D611BC3C00D0B769542201480F6C@cw-server.complianceworld>,
dated Fri, 6 Jul 2012, Larry Stillings <[email protected]>
writes:
FCC (ANSI C63.4 / C63.10) specifies a 60 cm shielded loop antenna for
measuring radiated emissions from 9 kHz to 30 MHz (magnetic field, Rod
antennas to measure electric field are not allowed).
The limit is written at 300 meters up to 490 kHz and 30 Meters from 490
kHz to 30 MHz. However, since you tend to be in the magnetic field of
the earth we make the measurement at some near field distance of 10 or
3 meters using 40 dB/decade extrapolation factor.
Thanks, but I would find the results difficult to trust, considering the
likely background noise level. Also, the field is most likely highly
inhomogeneous, so that you can get every result you like (or don't
like).
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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