FCC conducted emissions rules as specified in 47 CFR Part 15 only deal with AC line conducted and have no requirements for measuring a DC line. Consequently, anytime part 15.107 or 15.207 is referred to it is always talking about AC line conducted.
This of course is not speaking of antenna terminal measurements which sometimes are loosely referred to as conducted measurements also. For the example given the AC line conducted requirements of a USB intentional radiator is two fold. The intentional radiator is to be tested to 15.207 while actively transmitting. Since USB intentional radiators also will typically have digital circuitry (for data transfer to the host if nothing else) it will also have to be tested to 15.107 with the transmitter idle and the digital device active. This can be complicated as ANSI C63.4 and the FCC rules say the digital device is to be transferring data to and >from the host. These devices usually do this in conjunction with the intentional radiator actually transmitting at or close to the same time. In any event, as this type device would be a composite device operating under two distinct FCC rule parts (i.e. 15B for digital device/computer peripheral and 15C intentional radiator) each rule section must be satisfied and proper testing in accordance with CFR47 part 15 and ANSI C63.4 2003 must be done specific to each rule section involved. Dennis Ward Evaluation Engineer American TCB Certification Resource for the Wireless Industry www.atcb.com 703-847-4700 fax 703-847-6888 direct - 703-880-4841 cell - 209-769-8316 NOTICE: This E-Mail message and any attachment may contain privileged or company proprietary information. If you received this message in error, please return to the sender. From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: 04/10/2006 9:45 AM To: [email protected] Subject: Re: Fw: FCC equipment authorization: Have RFID devices operating @ 13.56 MHz been exempted from conducted emission testing? In message <003001c65cb8$0eb3a570$4001a8c0@CompaqPresarioD>, dated Mon, 10 Apr 2006, Dward ATCB <[email protected]> writes >Your understanding is not correct. A USB device plugged into any other >device that is directly connected to the AC mains will need an oine >conducted testing. Several examples are: A USB dongle that gets its >power from the USB port and is plugged into a laptop where the laptop >gets its power from the AC mains will require conducted emissions. 'Conducted emissions' on WHICH CABLE? The mains cable of the power supply or the DC cable from the power supply to the load equipment? Or both? -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. 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 [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - 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/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
