Most important is the filtered AC connection. Create a good ground point of a wiiide connection and connect it to your required reference plane = ground of receiver. Other wires connected to the EUT are in general too short to generate substantial signal on 50 ohm. While we do carry out these tests in our shielded room, I never found ANY difference between door open and door closed. I remember in the past that conducted measurements ware only causing me headaches with measurements on location, where no filtered ac was available.
Regards, Ing. Gert Gremmen ce-test, qualified testing bv Van: [email protected] [mailto:[email protected]] Namens Price, Edward Verzonden: Tuesday, September 30, 2008 4:20 PM Aan: [email protected] Onderwerp: RE: Shielding setup for conducted emission prescans 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 - 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
