In message <201048ea81ba0745aca78e4cc8839001037cf...@desmdswms201.des.grplnk.net>, dated Fri, 31 Oct 2008, "Haynes, Tim (SELEX GALILEO, UK)" <tim.hay...@selexgalileo.com> writes:
>Remember that when you apply a standard you are doing so on the basis >that the standard covers ALL the product EMC characteristics. > >IF you design a PC with a 3GHz clock and only apply a standard with a >1GHz limit and then there is a problem with real interference at 3GHz, >the authorities may not believe that due diligence had been applied. > >So I would start asking - what does the product do - and then find >standards that may be useful in making your EMC assessment. In almost all circumstances there is NO legal requirement in Europe to do this. If the applicable product standard does not cover a particular frequency range, the committee concerned saw no need for limits in that range, and by notifying the standard in the OJEC, the Commission has accepted that the standard gives prima facie evidence of complying with the Directive. You DO NOT have to trawl though all the EMC standards that exist, looking for another one to apply, almost certainly OUTSIDE ITS SCOPE. However, self-interest may suggest that if you know of any EMC effect not covered by the applicable standards, you should consider how to test and what VOLUNTARY limits to apply. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
