In message <[email protected]>, dated Mon, 19 Dec 2005, "James, Chris" <[email protected]> writes
>So look at the current wave forms not the voltages - I expect the UK >ones will be more peaky which will cause any mech "weaknesses" to sing >more noticeably. Yes, if the transformer is feeding a rectifier with capacitive filter, the peak current can be very high indeed. If the noise is due to winding vibration, the high peak current makes it worse. But if the hum is related to core saturation, the high peak current tends to pull down the peak supply voltage and thus the peak induction. -- Due to a virus attack, I've lost all my clever signature tags. Are you sorry? OOO - Own Opinions Only. See http://www.jmwa.demon.co.uk and http://www.isce.org.uk John Woodgate - 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
