Gary, Look at 47CFR15.33. Here I cut a piece out for you: investigation. (b) For unintentional radiators: (1) Except as otherwise indicated in paragraphs (b)(2) or (b)(3) of this section, for an unintentional radiator, including a digital device, the spectrum shall be investigated from the lowest radio frequency signal generated or used in the device, without going below the lowest frequency for which a radiated emission limit is specified, up to the frequency shown in the following table: Highest frequency generated or used in the device or on which the device operates or tunes (MHz) Upper frequency of measurement range (MHz) Below 1.705 ........................... 30. 1.705-108 .............................. 1000. 108-500 ................................. 2000. 500-1000 ............................... 5000. Above 1000 ........................... 5th harmonic of the highest frequency or 40 GHz, whichever is lower.
Thanks, Michael Sundstrom Garmin Compliance Engineer 2-2606 (913) 440-1540 KB5UKT "Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway." Earl Nightingale From: Gary McInturff [mailto:[email protected]] Sent: Thursday, January 28, 2016 1:16 PM To: [email protected] Subject: [PSES] Highest clock frequency in a device. I was looking through standards I have but can't find an absolute description of highest clock frequency. The overall device has clocks well below 105MHz, the point at which the spectrum above 1 GHZ must be investigated during radiated emissions. However one of the IC's has an internal frequency well above that. My understanding of highest clock would include this IC internal, contained within the chip and not provided to any I/O pins. Others disagree, but I can't find any explicit documentation that defines this. Can anyone pin point a textual definition? Thank you - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.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]>> ________________________________ CONFIDENTIALITY NOTICE: This email and any attachments are for the sole use of the intended recipient(s) and contain information that may be confidential and/or legally privileged. If you have received this email in error, please notify the sender by reply email and delete the message. Any disclosure, copying, distribution or use of this communication (including attachments) by someone other than the intended recipient is prohibited. Thank you. - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
