In message <[email protected]>, dated Mon, 8 Jun 2009, "ce-test, qualified testing bv - Gert Gremmen" <[email protected]> writes:
>There is also the Class A/Class B issue, that is different from all >other emc standards in the way that it does not allocate Class A to >industrial >locations and class B to residential locations. Not 'all' other EMC standards. CISPR 22 adopts the North American approach, rather than the European. Those differences have many legitimate causes: - no LF broadcasting in N America; - a very different transmitter infra-structure, mostly relatively short-range in N America, mostly country-wide and beyond in Europe; - much less spectrum congestion in the MF band in N America. The proper question in this case is not whether limits set more than 30 years ago (50 years in some cases) are met by modern products, but whether they are still justified. Products meeting only Class A limits ARE in use in homes in Europe. Is the level of interference complaints due to them unacceptable? It is widely known in the EMC world that certain PLT modems sold for home use in Europe have conducted emissions greatly exceeding the CISPR 22 limits. Are they causing floods of complaints of interference? I know that some radio amateurs have detected them, but then they can detect a 1 mW transmitter 20000 km away. (;-) -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
