In message
<of583e7385.c0c56cf9-on86257a9a.0040152b-86257a9a.00418...@mmm.com>,
dated Wed, 17 Oct 2012, [email protected] writes:
And has any of this OATS, SAR, FAR, and TEM cell data differences been
correlated to actual interference problems? Is the EMC industry crying
"wolf"?
The only practicable way to check is to look at the number of complaints
of interference, but many countries now don't collect them, and the
number of interference cases probably exceeds the number of complaints
by a large factor.
It is certain that if any manufacturer or industry association heard any
alarmist cries, representations would be made for speedy changes.
Limits and test methods should be based in reality. They should not be
academic exercises. For example, much of the world's products are in
the near-field of each other (cockpits, OR, control rooms, etc.). Why
aren't there near field test procedures? Yes, I know the problems but
those are just excuses. Methods need to be developed (and alas, I'm not
smart enough).
The problems are not excuses, any more than an inability to develop
anti-gravity is an excuse. Ye canna change the laws o'physics, Cap'n!
Near-field measurements are horribly non-repeatable and, in almost all
cases, cannot be relied on in a regulatory context.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
The longer it takes to make a point, the more obtuse it proves to be.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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