I read in !emc-pstc that Gert Gremmen <[email protected]> wrote (in <[email protected]>) about 'Dwell time for Immunity under EN55024?' on Thu, 3 Oct 2002:
>The test will give you only PRESUMPTION of compliance anyway. It is extremely misleading to cast continual doubt on the standards route to compliance simply through hints about this word 'presumption'. The acceptance of a standard by CENELEC, by the Commission's EMC consultant and by the Commissioner's own staff, authorizing its notification in the OJEC, signifies that these experts consider that the standard IS SATISFACTORY for manufacturers to rely on, i.e. that it gives dependable evidence that the essential requirements are met. Wording in CENELEC and Commission documents that appear to 'water this down' are almost all covert (why?) references to the fact that adopted CISPR product-family standards deal only with emissions above 9 kHz, **and that EN61000-3-2, -3-, -11 (and -12 when it is published) that deal with emissions below 9 kHz**, have to be applied as well. It is extremely unfortunate that these words have been interpreted (sometimes for monetary gain) to mean that manufacturers have a duty to trawl though ALL published EMC standards, whether their scopes include the product in question or not, looking for additional tests and limits to apply. In the case of CISPR 14-1, the absence of limits for emissions in the UHF TV bands appears to be a serious defect, which should be dealt with under Article 8 of the Directive. It certainly seems surprising that no cases of, for example, small kitchen machines with commutator motors producing UHF TV interference, have been reported over the many years since CISPR14/EN55014 has been in place. Interference from such sources was the subject of the little-known (outside Europe) first EMC Directive, before the present one. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
