I was pondering how best to answer the OP but Gert Gremmen beat me to it with better words than I would have used.
With regards to the last question, GTEMs are only good for the test sample enclosure itself, not the attached cables. When using a GTEM, I have told customers to measure cable common mode conducted emissions (CMCE) first, control them to a level based on an algorithm relating CMCE to RE at the required separation, and when that is complete, go into the GTEM and any failures are then known to originate from the test sample enclosure, not the cables. Similarly, for RS, apply BCI or 61000-4-6 to the cables at the appropriate level first, then go into the cell and any problems found there are due to the test sample enclosure. Ken Javor Phone: (256) 650-5261 > From: Brian O'Connell <oconne...@tamuracorp.com> > Reply-To: Brian O'Connell <oconne...@tamuracorp.com> > Date: Tue, 18 Jul 2017 17:22:35 +0000 > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Conversation: [PSES] Chamber grounding [General Use] > Subject: Re: [PSES] Chamber grounding [General Use] > > Warning Will Robinson - Brian is not an EMC expert. > > Agree with Herr Gremmen about the referencing of equipotential points - this > was critical for my employer's current chamber because it was sitting next to > a machine shop and a HALT chamber. Would suggest two or three cups of tea, > followed by some ale, while pursuing a good reading of the EN50147-x series > and ANSIC63.4 and CISPR16 and the various Bugs Bunny cartoons. > > Related question - am wondering why, other than physical size of UUT, industry > prefers anechoics in lieu of GTEMs? > > Brian > > > From: Gert Gremmen [mailto:g.grem...@cetest.nl] > Sent: Tuesday, July 18, 2017 8:49 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Chamber grounding [General Use] > > As for the purpose of operation, EMC chambers need no grounding. > The shielding property happens by conduction of the shield material the > chamber is made from. > But as soon as mains filters are mounted on the wall, one has to cope with > leakage currents > (blind current) as large as 6 amp or more. This is definitely lethal on the > touch so I recommend a > grounding of 4-6mm2 copper in addition to the ground lead in the mains > connection. > I suggest leading both grounds to the building ground, as that is an > equipotential point, made for safety. > But again, an ungrounded chamber performs the same as a grounded one. > Gert Gremme > -----Oorspronkelijk bericht----- > Van: Price, Andrew (Leonardo, UK) [mailto:andrew.p.pr...@leonardocompany.com] > Verzonden: dinsdag 18 juli 2017 16:55 > Aan: EMC-PSTC@LISTSERV.IEEE.ORG > Onderwerp: Re: [PSES] Chamber grounding [General Use] > Hi All > Which is the best to use? > Ground each EMC chamber via an earth spike or back to the transformer of the > supply to the building? > Which is best practice? > Regards > Andy > > Andrew Price > Land & Naval Defence Electronics Division > Prinicpal Environmental Engineer (EMC) > Leonardo MW Ltd > Sigma House, Christopher Martin Rd, Basildon SS14 3EL, UK > Tel EMC LAB : +44 (0)1268 883308 > Mobile: +44 (0)7507 854888 > > andrew.p.pr...@leonardocompany.com<mailto:andrew.p.pr...@leonardocompany.com> > leonardocomapany.com > HELICOPTERS / AERONAUTICS / ELECTRONICS, DEFENCE AND SECURITY SYSTEMS / SPACE > * Please consider the environment before printing this email. > > > Leonardo MW Ltd > Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 > 3EL A company registered in England & Wales. Company no. 02426132 > ******************************************************************** > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
