I'm with Ghery on this one. All HDMI cables are not created equal. Screening of the backshell and connection of the cable shield is critical.
James -----Original Message----- From: Pettit, Ghery [mailto:[email protected]] Sent: 04 September 2014 08:46 To: [email protected] Subject: Re: [PSES] FCC EMI Test and Ferrites on Cables You are highly unlikely to find the ferrite prayer beads at Best Buy. If you don't specify which ones to get you have no idea what the result will be. I think you are correct, the beads must be shipped with the product. The right ones, to boot. Now, how does the designer know that he needs ferrite beads? My experience has been that many (most?) HDMI cables do not have their shields terminated properly, if at all. Once the shields are terminated correctly problems go away. Could this be a better solution? Ghery S. Pettit -----Original Message----- From: Scott Douglas [mailto:[email protected]] Sent: Wednesday, September 03, 2014 11:31 PM To: [email protected] Subject: [PSES] FCC EMI Test and Ferrites on Cables Fellow List persons... Please help refresh a tired brain. A designer of a product tells us that he passes FCC emissions testing if he puts ferrite sleeves (beads?) on the four HDMI cables connected at the rear panel of the product. He tells us that all he needs to do is add a statement in the user manual to the effect that the HDMI output cables must have ferrite sleeves (beads?) on them. He says he does not need to specify manufacturer name and part number of the ferrites. He says he does not need to provide the ferrites with the product. He also does not plan to include the HDMI output cables with the product because every installation will have different length HDMI cables needed. Now, my old brain thinks the above is not acceptable and that the FCC says that anything special needed to pass FCC testing must be provided with the product. And I am thinking that ferrites are special as you can't get them at Walmart or Radio Shack or Ace Hardware. And not all ferrites are the same. Can anyone confirm my memory and maybe give a pointer to the part of the FCC Rules that clarify this? Or have the rules changed over the years and I just missed that part? Thank you in advance for any and all comments, on list or off. Best regards, Scott - ---------------------------------------------------------------- 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]> - ---------------------------------------------------------------- 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]> - ---------------------------------------------------------------- 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]>
