In message <946f26262d1d3a43bc6b5114c624f26c1636c7d...@delvspr01.deltarail.com>, dated Fri, 28 Aug 2009, Andrew McCallum <[email protected]> writes:
>Many manufacturers of switch mode power suppliers now only seem to be >carrying out testing of conducted emissions to 100MHz >Claiming that previous work has shown that there are no significant >radiated emissions from these power suppliers. It's not safe to assume that, except for products that use the same semiconductors and transformers as previous designs. Even then you can be caught out if a semiconductor maker has improved his process to decrease switching speeds. I recommend pre-compliance testing up to 1 GHz for new designs. If that doesn't show stuff above 100 MHz, then stick to the standard test. > -- 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]>
