In message <[email protected]>, dated Mon, 10 Dec 2007, Grace Lin <[email protected]> writes:
> Clause 5 of EN 50147-2: 1996 states: > >"The vertical and horizontal polarization measurements in the rear >position may be omitted if the closest point of the construction and/or >absorbing material is at a distance greater than 1 m from the rear >boundary of the tes volume." EN 50147-2 is very old in the rapidly-developing context of semi-anechoic chambers. > >I assume keeping a 1 m distance is a good idea. Yes, that's what 50147-2 implies, otherwise you have to do extra measurements. It's not mandatory to have more than 1 m separation. > However, a chamber manufacturer has a difficulty to do so. I suggest you look at CISPR 16-1-4, 16-2-3 and 16-2-4, being much newer standards. Unfortunately, the treatment of semi-anechoic chambers is still incomplete. Maybe someone here who participates in CISPR/A work can give more information. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk For very important information, please turn over. 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
