On Wed, 18 May 2016 21:19:00 +0000, John Allen <[email protected]> wrote:
> I would like to get thoughts on if EMC testing is required for CE on a > product that does generate noise, but is installed 30 feet below the surface > of water. > > I'm guessing conducted radiation is still a concern, but what about radiated > and immunity?? Does it matter if it's 30 feet below or 3 feet?? If the attenuation data in http://file.scirp.org/pdf/JEMAA20110700001_18390291.pdf Electromagnetic Wave Propagation into Fresh Water is appicable, for 30 MHz, about -10 dB attenuation may be expected at 10 m, which may not enough to ignore radiated emissions and immunities. In addition, some RF may propagate up/down through the cable. I guess radiated emissions/immunities can still a matter. Regards, Tom -- Tomonori Sato <[email protected]> URL: http://t-sato.in.coocan.jp - ---------------------------------------------------------------- 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]>
