The requirements are contained in FCC Rule 15.33(b), link below. Link to FCC Rule: http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=95050fadbf8221ee200d727bb713323a&rgn=div8&view=text&node=47:1.0.1.1.16.1.234.18&idno=47 An excerpt from this rule states:
"Highest frequency generated or used in the device or on which the device operates or tunes" My interpretation: If the EUT generates it, that's the highest frequency. If the EUT uses it, that's the highest frequency. If the EUT operates with it, that's the highest frequency. If the EUT tunes to it, that's the highest frequency. Application: If it exists anywhere within the EUT then it's the highest frequency. Regards, Manny Barron EMC/EMI Engineer Northrop Grumman San Jose, California From: [email protected] [mailto:[email protected]] On Behalf Of Mcburney, Ian Sent: Thursday, July 05, 2012 8:13 AM To: [email protected] Subject: EXT :FCC maximum frequency measurement Dear Colleagues; I am trying to establish the maximum measurement frequency for radiated emissions for a digital device that is an unintentional radiator (part 15). Is it set by the highest frequency generated internally in a microprocessor or DSP or is it the maximum frequency that is tracked "chip to chip" on a PCB. Some of our components have high frequency internal clocking relative to PCB tracked clocking. Thank you in advance Ian McBurney Design Engineer Allen & Heath Ltd Kernick Industrial Estate Penryn, Cornwall TR10 9LU United Kingdom +44 (0)1326 370121 [email protected]<mailto:[email protected]> www.allen-heath.com<http://www.allen-heath.com/> A DMH Pro Company<http://www.dmh-global.com/>. - ---------------------------------------------------------------- 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]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[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://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]>
