I read in !emc-pstc that Gary McInturff <Gary.McInturff@worldwidepackets .com> wrote (in <[email protected] >) about 'EN6100 3 2 1998 repeatability test', on Mon, 19 Aug 2002:
>This is the harmonics test. > The 1998 version which goes into effect about 2004 has a clause that >says the test has to be run twice and the results compared. It helps a great deal if you give the clause number of any requirement that you question. Do you mean 6.2.3.1 in this case? > The comparison seems >to be fairly restrictive from what I am hearing, and a number of failures >being >reported because they two runs, while within specifications individually do >not >compare exactly with each other. One of the harmonics might be 6% different >than >the other and this causes a test failure. I'm quite sure that 6.2.3.1. is NOT intended to mean that, but I didn't write it. I will pass this question to the people who did. For the higher harmonics, certainly above the 21st, quite large variations between test runs can occur for no apparent reason. Provided no limits are exceeded, these variations are of no significance. > Can anybody comment with more knowledge of what is happening and > whether >or not this is causing a review of this requirement? I haven't heard of this problem before. It has not been previously raised in IEC SC77A/WG1, and members have now asked if you can be more definite about what equipment was rejected and if possible, by whom. You may send that information to me by e-mail as it may be sensitive. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
