Hi Tom,
I remember attending an interesting talk given by Ralph Calcavecchio
of IBM, one of the original CIPSR22 guys, who gave us a bit of
historical background.
Basically, CISPR22 radiated emissions limits were determined
empirically by measuring levels at various sites, from which class A
and B limits were determined owing to the much larger level of
emissions at industrial sites than elsewhere.
So why are the limits for susceptibility so much higher than for
emissions? This is due to the situation where you have a hand-held
radio device which can therefore be in close proximity to potentially
susceptible equipment (e.g. night-watchmen on patrol).
I can't comment on any measures which the FCC took, but will watch the
newsgroup with interest to learn from my American colleagues.
Best regards,
Dave Wilson
InterConnect Communications
______________________________ Reply Separator _________________________________
Subject: How the limits determined?
Author: MIME:t...@superlink.net at INTERNET
List-Post: emc-pstc@listserv.ieee.org
Date: 15/01/97 09:50
Can anyone give me some background or history information on how the
radiated and conducted emission limits were determined by FCC and CISPR, in
terms of the field strength level? Any research supports the limit level?
Any input will be greatly appreciated.
Regards,
Tom
http://www.rcic.com
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InterConnect Communications Ltd
Tel: +44 (0) 1291 620425
Fax: +44 (0) 1291 627119
WWW: http://www.icc-uk.com/
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