Thanks John. Load-switching transients are a good rationale for doing transient testing on DC output leads regardless of length, but I'm not sure I'm out of the woods yet.
Wouldn't the same rationale apply to DC input leads, regardless of length? If so, how come the standard exempts them if the leads are less than 10m long? If my equipment's input shares a DC circuit with other loads, and they almost always do in our applications, then actually there is a higher likelihood of load-switching transients on the input than on the output! By the way, it was not my intention to start a large thread on the niceties of grammar, or to brag, but, in answer to Rich's question, I actually got 100% in my final year of high-school grammar (they gave out bonus points on tests), and I too am a fan of the comma's ability to help with the understanding of long, complex sentences, to control cadence, to provide breathing space, to slow the eager rush of our eyes to the next word if not to stop it altogether, as the comma grips us like a bird grips a worm, an eagle grips a fish, or this drivel grips your lunch, and to bring clarity to a world of long-winded, convoluted, obfuscationary, self-important verbiage, that clutters our mind like...Oh, never mind. You get the idea. Merry Christmas everyone! Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: [email protected] web: www.xantrex.com Any opinions expressed are those of my invisible friend. Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: Friday, December 17, 2004 5:40 AM To: [email protected] Subject: Re: EN61000-6-1 - Grammar and testing on DC power ports In article <2147F6D97127F6428E40FF35EA522B97C86593@xbc- mail1.xantrex.com>, Jim Eichner <[email protected]> writes >Does anyone know the intent? The table heading says that the whole table is applicable to both input and output ports. Note $ (Note 3 in the EN version) simply qualifies this. >What are test houses actually doing - >testing both or just DC inputs? You may well ask. >If they are testing DC output ports, is >there a 10m criteria? Can anybody explain or speculate why a 10m >criteria for DC output cables would not be appropriate? Because it is considered that surges and transients can result from load switching, irrespective of cable length, as well as induction on to long cables. -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. 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/listserv/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] 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 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: 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
