Well in some cases the "imitation of real life operation" in testing had been given up if favor of reproducibility. Anyway, an equipment of which the immunity performance depends on its cable length...., well you know what I mean.
In general I support John Davies approach, but have to add that the disturbance power test could well be replaced by a conducted power test at then mains port, using a suitable CDN. Most standard CDN's go to 230 MHz , upgrading to 300 MHz seems no real problem. Since vacuum cleaners all have wireless internet now and a hard disk for data logging, soon the conducted power test need to be replaced with a standard OATS/SAR/FAR type of radiated emission test up to 5 GHz just as standard IT equipment. Then all conducted test could standardize to 30 cm of cable length.. Regards, Ing. Gert Gremmen [email protected] www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. -----Oorspronkelijk bericht----- Van: [email protected] [mailto:[email protected]] Namens John Woodgate Verzonden: Wednesday, February 09, 2011 10:10 AM Aan: [email protected] Onderwerp: Re: [PSES] EUT power cord length In message <[email protected]>, dated Wed, 9 Feb 2011, "John Davies, Blackwood Labs" <[email protected]> writes: >In my opinion the length shall always be as the standard dictates and >there are good justifications for the differing lengths in differing >standards (even though the standard in question may not explain, but >simply instruct). But products with non-detachable cables don't have their length varied in the field according to which disturbance they are being exposed to. I can't see any justification for altering the length of a non-detachable cable. If its length magnifies or attenuates the disturbance, so be it, that is what happens in real life. Consider the incongruity of testing, say, a vacuum cleaner with a 0.5 m cable. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Plural: data, criteria, phenomena. Singular: datum (different meaning: use 'data element' for a single item), criterion, phenomenon. 'Effect' is a noun, 'affect' is a verb (except in psychiatry). - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
