In message
<e79b96282e4f9f43baf7c6d3d578acde07560...@ca1exclv07.adcorp.kla-tencor.co
m>, dated Wed, 25 Jan 2012, "Crane, Lauren"
<lauren.cr...@kla-tencor.com> writes:
With regard to the EU EMC Directive, can anyone recommend a rule of
thumb for when it can be said that equipment is a) incapable of
generating or contributing to electromagnetic emissions which exceed a
level allowing radio and telecommunication equipment and other
equipment to operate as intended; and
b) it will operate without unacceptable degradation in the presence of
the electromagnetic disturbance normally consequent upon its intended
use?
No, the authorities balked at it and 'leave it to the Courts to decide'.
My rough guess for a) is that it is fair to claim if the equipment
emissions are below 20% of the limit line for the same group & class of
equipment.
I don't think you will get away with that (-14 dB(limit)) with the EMC
zealots. I should think 40 rather than 14 would be needed to satisfy the
zealots.
My rough guess for b) is that it is fair to claim if the equipment has
operated in its intended environment without known errors due to
electromagnetic disturbance.
I think you might succeed with that.
The thesis I am exploring here is that an known EMC emitter is not
necessarily in scope of the EMC directive if Article 1.3 is valid, and
what is a sound way to test its validity.
As I indicated, I doubt there is a 'sound' way. If there was a body of
case law....
Although I cannot find it explicitly in the RTTE directive, I wonder if
there is a similar concept in practice ? radio equipment having such
low power levels such that they are considered benign?
I haven't seen anything like that.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Some people who are peeling the finch of the financial crisis are thinking of
biting a rook.
-
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