I read in !emc-pstc that Kurt Fischer <[email protected]> wrote (in <03d401c426e5$bc6098f0$6400a8c0@HYPERC1033>) about 'EN61000-3-2 repeatability test' on Tue, 20 Apr 2004: >Hello, > >I do not have a copy of the standard so I am relying on memory: > >1. The 5% repeatability requirement stated in the standard refers to >Instrumentation repeatability and validation (as Ken referred to in his >email).
You are substantially correct, and steps will be taken to try to get the wording of the standard clarified in this respect. > >2. The problem stated in Pat's email is that the EUT has different >measurement results when measured at different times. The reason may be that the results depend on the harmonic content of the supply waveform, the temperatures of the parts in the power supply of the EUT and the phases of the moons of Jupiter (all 60 of them!). > >It seems that the solution path is to determine why the EUT generates >different LF emissions profiles and determine if these profiles meet the >limits in a reasonable number of cases or trials per the standard. Yes. > To the >best of my memory, there is no requirement that the repeatability >measurements of the EUT itself be +/- 5%. > Yes. That needs to be clarified. -- 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 EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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://www.ieeecommunities.org/emc-pstc
