"Anchondo, Dan" <[email protected]> wrote (in <[email protected]>) about 'Problems with surge testing', on Fri, 9 Dec 2005: >The variability is something I had forgotten. You can't exactly repeat >any test but you can come reasonably close.
For most tests, that's true, but it isn't for single-phase rectifiers with capacitive smoothing. TINY changes in supply voltage, component values (including temperature effects) and the characteristics of the test supply can make very large differences indeed (400%!) to the high-order harmonic current emissions (IEC/EN 61000-3-2 and -12). This is why IEC SC77A is having to address the subject. -- Regards, John Woodgate, OOO - Own Opinions Only. Deadlines are 90% of deadliness. http://www.jmwa.demon.co.uk Also see http://www.isce.org.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
