In message <[email protected]>, dated Tue, 20 Mar 2007, Mark Gandler <[email protected]> writes:
>Would you consider linear power adapter : 240V to 12V/1.5A consists of >the transformer, bridge rectifier and capacitor to be EM active device? >If it is not active, will it be safe to assume what it will be excluded >from 89/336 directive based on EU guidelines? No, because it emits mains harmonic currents and, depending on the type of diode in the rectifier, perhaps emits conducted noise above 150 kHz. However, it's certain that its mains harmonic emissions are subject to no limits according to IEC/EN 61000-3-2 (lower bound for the application of limits is 75 W active input power), and 99.99% certain that it meets the limits for conducted emissions above 150 kHz. So, although it's not *excluded*, it can safely be claimed to meet the essential requirements of the EMC Directive without testing. Note that 89/336 is the old Directive, to be superseded for some purposes on 20 July this year and wholly on 20 July 2009 by the new Directive. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. 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 [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
