In message <003f01c68d83$8e612080$6de107c3@x8i2i2>, dated Sun, 11 Jun 2006, Jeff Chambers <[email protected]> writes
>Now, we have here a Seaward 'Screened Room', about ten years old, > which is basically a 'tent' of metallised fabric draped over a metal >framework, with a metal floor. It was sold for emc work, has a >solid-looking door, plus a filtered mains inlet. Is the filter still OK? The capacitors might be open-circuit. >Its about 5m x 3m x 3m, and I'd like to use it to provide confidence >that designs are well within emissions limits, rather than try to >justify things close to a limit. Its literature of the time claimed >60dB to 80dB attenuation. > >But... it doesn't seem to offer much attenuation to FM radio signals! Think 'tarnishing'. All joints probably need cleaning **carefully**. Ask Seaward how to do it. > >It's only ground is via the mains inlet, i.e. not much of an rf ground. >Otherwise it's just sat on the factory floor. I have a building girder >very close by emerging from the floor - should I ground the room to >that? Just try it! But I doubt that earthing is the problem. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
