I would suggest that you do need to test at both supply voltages; but more significantly, your greatest problem is unlikely to be your product but the host PC. You need to select your host PC very carefully to ensure that it is compliant, and that it is quiet enough for you to be able to tell whether or not your device is contributing to the emissions.
Best regards Neil R. Barker CEng MIEE FSEE MIEEE Manager Compliance Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453410 Mob: (+44) 7801 723735 From: [email protected] [mailto:[email protected]] Sent: 06 October 2005 04:17 To: [email protected] Subject: Conducted emission testing for FCC & CE. Dear Experts, Our product is a USB device connected to the PC USB host and operates at 5 volts D.C supply provided by the host system. Both FCC & CE insists that conducted emission testing is required for this kind of devices, with emissions measured at the a.c input side. Is it necessary to run 2 tests, one with a 230 volts 50 Hz a.c supply (for CE) and the other with 110 volts 60 Hz a.c supply (for FCC)? Sincerely K.Balasubramanian Project Leader - Hardware. - ---------------------------------------------------------------- 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 [email protected] Instructions: http://listserv.ieee.org/listserv/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
