Ian, I know of one PS manufacturer who states that their power supplies complies only with Criterion B during EFT en Surges although the output voltage remains within the limits of the normal operating conditions (Ex. 9V +/-5%). The reason for this is that there may be very small pulses, nsec or usec, of Common mode or Differential mode, that may still appear at the output and are out of the declared normal operating conditions.
Best regards, Kris Carpentier Regulatory & Approvals From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of iun...@servomex.com Sent: donderdag 18 mei 2006 15:47 To: emc-p...@ieee.org Subject: Burst and surge tests Dear Group, I have a question regarding the likely behaviour of ac to dc switch mode power supplies during fast transient burst tests to EN 61000-4-4 and surge tests to EN 61000-4-5. For a manufacturer to claim conformity to these standards are any constraints placed on the behaviour of the dc output voltage during the tests? I am particularly interested in the likely change in DC voltage output as the appropriate burst/surges are applied to the ac input. Many thanks in anticipation of your replies. Best regards Ian Unwin Lead Engineer Servomex Group Limited ********************************************* *Register now at www.servomex.com/zap.html * *for an opportunity to win a great prize * *in our monthly draw. * ********************************************* ________________________________________________________________________ This email has been scanned for all viruses by the MessageLabs SkyScan service. This electronic message contains information from Servomex which may be privileged or confidential. The information is intended to be for the use of the individual(s) or entity named above. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this electronic message in error, please notify us immediately. Activity and use of the Servomex E-mail system is monitored to secure its effective operation and for other lawful business purposes. - 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 emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - 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 emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
