Don't forget to include a low-pass filter for the AC powerline where it enters your shielded work area.
Another alternative might be to find a used TEM or GTEM cell. It will give you shielding, plus you can also do radiated emission and immunity pre-scans too. Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (FAX) Military & Avionics EMC Is Our Specialty > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Ken Javor > Sent: Tuesday, September 30, 2008 6:53 AM > To: Untitled > Subject: Re: Shielding setup for conducted emission prescans > > I'm going to go out on a limb here and disagree with Mr. > Woodgate. Not that what he said was wrong, just overkill. If > all you are worried about is conducted emissions from 150 kHz > to 30 MHz, and if the AM BCB is the only licensed high power > transmitter of concern (TV BCB starts at 54 MHz, and FM at 88 > MHz), then all you need is some chicken wire stretched over > that 2x4 frame. I wouldn't even worry about soldering or > otherwise making an ohmic connection between different > sections of the chicken wire, just assure yourself plenty of > overlap. And make sure the door closes well and the metallic > cladding goes all the way around from the outside to the > edges and at least a little on the inside, and make sure the > door frame is likewise coated and that coating makes a decent > connection to the chicken wire. That is all you will need - > no fingerstock, no gasket of any kind. AM is such a long > wavelength it can't get through even the rather large chicken > wire interstices of an inch or more. > > Ken Javor > > Phone: (256) 650-5261 > > > > From: "Gelfand, David" <[email protected]> > > Date: Tue, 30 Sep 2008 09:08:19 -0400 > > To: <[email protected]> > > Conversation: Quiet PC for RE > > Subject: Shielding setup for conducted emission prescans > > > > Hi all, > > > > I do conducted emission prescans, but do not have a > shielded room. A > > few AM radio stations come in loud and clear. I was considering > > building a wooden frame and covering it with mesh to shield > the setup. > > Our products are mostly smaller than a breadbox. Any > suggestions would be appreciated! > > > > Thanks, > > > > David > > > > > > David Gelfand > > Conformity Specialist > > Kontron Canada Inc. > > 616 Curé Boivin > > Boisbriand QC > > Canada J7G 2A7 > > 450 437 5682 x2449 - 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
