In message <[email protected]>, dated Thu, 29 Sep 2011, Nic Johnson <[email protected]> writes:
>When testing a USB PC peripheral to FCC part 15, does anyone know if >you need to go up to the 5th harmonic of the highest frequency of the >PC or just the highest frequency used in the peripheral? I can?t find >any rules that say this specifically. Does this also relate to CISPR 22/EN 55022? It seems to me that if it means the highest frequency used in the PC, you could get an optimistic result by using a very 'slow' PC and therefore you would have to use a PC with the highest possible frequency, and that is impracticable because such a beast may not be available to you, and tomorrow there could be a faster one. My conclusion is that logic dictates that it is the highest frequency used in the peripheral. But interpretations of standards are not always based on logic.(:-( -- 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 When I point to a star, please look at the star, not my finger. The star will be more interesting. - ---------------------------------------------------------------- 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]>
