Or the classic, cables through the room wall... Derek Walton
John Woodgate wrote on 3/22/2005, 11:24 AM: > Geetha Balasubramanian <[email protected]> wrote (in > <[email protected]>) about 'Radiated > Emission Testing', on Tue, 22 Mar 2005: > > > There are 2 clock sources in the device, one runs at 12 MHz and the > >other runs at 4 MHz. Frequencies showing up in the US lab report are > >atleast the harmonics of these 2 frequencies. But frequencies mentioned > >in the Taiwan lab report are looking funny (111.27, 135.3, 285.69 MHz. > >etc.) > > That does look odd. I wonder if they left the door open! > > > US lab tested in OATS but the TAIWAN lab tested in a > >anechoic chamber. I heard that chambers are not the correct way to > >measure ( always the results will be wrong) that is why FCC never > >accepts chamber measurement. Is it so? > > It's a very difficult issue indeed. I wouldn't advise you to pursue > that. > > I really feel that you should simply accept the report and supply the > USB cable with a ferrite. The alternative would be to go to Taiwan with > a new sample, measured in USA and shown to pass, and measure it again in > Taiwan. The cost of that would pay for thousands of USB leads, and your > test results in USA do not encourage confidence that you would be able > to convince the Taiwanese authorities to pass the product. > -- > Regards, John Woodgate, OOO - Own Opinions Only. > There are two sides to every question, except > 'What is a Moebius strip?' > http://www.jmwa.demon.co.uk Also see http://www.isce.org.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/listserv/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: > > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > -- Cheers, Derek Walton L F Research Poplar Grove, IL 61065, USA 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
