Mark, I would say not. Your adapter includes diodes, which are a form of switching device and will cause interference of some description to an extent that depends on the speed of the diodes. An EM passive device would be something like a filament lamp or an electric heater (providing it doesn't have a thermostat); i.e. items that draw a constant current at supply frequency. You are fortunate that you are considering a low power device, otherwise you would definitely be having to consider harmonic emissions; a simple rectifier/capacitor configuration generates those very well. As a technicality, forget 89/336/EC. It was repealed and replaced by 2004/108/EC. Best regards
Neil R. Barker CEng MIET FSEE MIEEE Manager Quality Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453571 Mob: (+44) 7801 723735 P Please consider the environment before printing this email. From: Mark Gandler [mailto:[email protected]] Sent: 21 March 2007 00:45 To: [email protected] Subject: EMC Directive requirements for LINEAR power adapter Group, I am not sure how I ended up caring so much for power adapters recently, but they just will not go away. 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? See http://ec.europa.eu/enterprise/electr_equipment/emc/guides/chapfive.htm Thanks, Mark Gandler ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ Sent by E2V TECHNOLOGIES PLC or a member of the E2V group of companies. A company registered in England and Wales. Company number: 04439718. Registered address: 106 Waterhouse Lane, Chelmsford, Essex, CM1 2QU, 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
