In message <off6ed2562.359b1b29-on88257500.005e3ee6-88257500.00614...@slpower.com>, dated Thu, 13 Nov 2008, pat.law...@slpower.com writes:
>I need to run EMC tests on a piece of high-power medical equipment that >is used on an intermittent basis. The run time is about 15 seconds to >2 minutes on-time, followed by about 10 minutes off-time. This is >comparable to typical system usage. This causes problems with EMC >testing, since you normally need a longer observation period. What needs a longer observation period? In principle, you should test the product at as near its normal operating conditions as possible. The further you deviate from them, the less trustworthy your results are. In the worst case, a serious problem might be hidden. Don't forget that the EMC assessment required by the new Directive gives you the opportunity to justify your decisions about test procedures and much else that is not directly in conflict with the standards you apply. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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 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: dhe...@gmail.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
