Several years ago we combined panels from two enclosures to build a 24' x 16' x 10' high shielded enclosure. Working with Ray Proof we converted this enclosure into a fully compliant 1000-4-3 test chamber. Field uniformity is good with several frequencies having only 12 of the 16 points in the -0 to +6 dB range. Anechoic material consists of base loaded 24" Ray Proof cones on all walls and ceiling and a 2m x 3m ferrite grid placed on the floor between the Tx antenna and UUT/uniform plane. Note that the cones are not standard RF absorber material but are optimized for low frequency performance. I believe that they were spec'ed at 6dB absorption at 100 MHz. Hope this helps. I consider this solution to be close to minimum cost for a compliant chamber, but am curious as to other solutions.
Doug Frazee EMC Compliance Engineer Alliant Techsystems, Inc. Advanced Technology Applications 401 Defense Highway Annapolis, Maryland 21401 USA Tel: (410) 266-1793 FAX: (410) 266-1853 [email protected] >---------- >From: WOODS, RICHARD[SMTP:[email protected]] >Sent: Tuesday, May 06, 1997 12:02 PM >To: EMC >Subject: IEC 1000-4-3 testing > >Have any of you achieved positive results in performing tests to IEC >1000-4-3 in a partially lined shielded chamber? I would like to hear how >you did it. > >I would also like to hear from anyone who can provide publication >references on the construction of partially lined chambers for testing >to the standard. > >Lastly, I would like to hear from anyone who successfully converted a >shielded chamber to an anechoic or semi-anechoic chamber that is >compliant with the standard. > >Thanks! > >Richard Woods >Sensormatic Electronics >
