Hi PSTC Forum, Recently I reveived an enquiry regarding testing wall warts (AC/DC adaptors) to IEC 61000-4-4 and -5 without their 'wards' ( portable device like Cellphone, Laptops, PDA, MP3 player etc..). I note that these wall warts are bundeled and sold together even though these are ususally general purpose and can be bought 'off the shelf' in a 'supermarket'.
What is our take on this. Tim Foo Wei Chong, Looks like the question concerns wall warts (AC/DC adaptors). On the surface I would say that since the wall warts are bundeled together with the product and sold as 'one set', they should be tested together. As far as EMC is concererned, if these wall warts are tested as a standalone unit, it is unlikely to get representative results because of the dynamic nature of the load the wall warts would face in the field. There again, if it is strictly compliance testing... speaking as a product designer, we should onlt test to pass the item in question. Note that CE+CE is not Equal to CE <snip> With your permission I ... forward your question to the IEEE PSTC (Product Safety Technical Com.) Forum and you will no doublt get a lot more from the 'group'. Otherwise you can join the miss mash if you don't mind the loads of responses from out-of-office replies and what-have-you every time one send in a posting into the forum. Details are below... :-) sincerely Tim Foo <usual PSTC footer ...snip> Dear Mr Foo, Recently I was looking thru the IEC 61000 series document (IEC 61000-4-5 is one of those, see enclosed). It actually spell out the requirement needed to withstand for AC operated electrical product, under a "noisy" AC supply environment. After further investigation on the requirement, it seems like for those portable device like Cellphone, Laptops, PDA, MP3 player etc..need NOT undergo these requirements. Infact only the charger is required to test the IEC1000 requirement and not the portables. I'm just curious why the requirement did not insist on testing the product as a whole, ie testing the IEC 61000-4-5 together with the charger & the portable, since many a times people do use the portable when it's charging... Just in case you are not the right person to answer, would appreciate you could help to forward my queries to anybody whom you know of that can help. Thank you. Best Regards WeiChong 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/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Scott Douglas [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://www.ieeecommunities.org/emc-pstc
