Hi Shaike and Everyone, I recently purchased an EMCO 5317 GTEM and I was more than a little skeptical about the readings and how they would correlate to the local OATS sites. After using it for several months now I am amazed at how well we are able to correlate. With regards to Ken's statement about the cables, we have seen good correlation even with lots of cables as long as they are loaded with ferrites per the IEC 61000-4-20 Standard. Best regards, Dennis -- Electro Magnetic Compatibility Engineer EMI Test Lab Lab (303) 684-6650 Cell (303) 746-0611 emitestlab.ccom
-------------- Original message -------------- > Hi Shaike/ Net, > > 1.) Yes, the GTEM is acceptable as alternative site for CISPR 11/22 radiated > testing under certain limiting conditions e.g. cable/EUT size restrictions. > From a physics point of view the concept of radiated total power (free > space-radio/wireless approach) has many advantages over OATS (ground plane). > > From the normative side: Battery operated equipment however does normally > not cause discussions about compliance acceptance of GTEMs. > Check also IEC 61000-4-20 -2003:Testing and measurement techniques –Emission > and immunity testing in transverse electromagnetic (TEM) waveguides > Please consult further CISPR 16-..., ANSI C63.4 2003. Keep in mind normative > references in CISPR22/11 may still go back to the old (no TE! M device) CISPR > 16 series as basic standards. Many changes are presently ongoing in the > standards. There is also the issue of IEC vs. EN standards, as well as > harmonized standards (OJ EU). Given the new EMC directive many formerly > hidden trends in compliance (EU) thinking are now spelled out more clearly, > but..... > > The big issue has always been (an inventors view) correlation to OATS > results. This has been proven technically over the last decade to be ok > within about 5dB margin-GTEM readings are sometimes more on the conservative > side. It turns out the GTEM is even more reproducible/repeatable than OATS > testing. Traceability is no problem. The German metrology institute (PTB) > uses 2 GTEMs among others for sensor calibration (reciprocity to emissions). > The test volume/GTEM size is naturally an issue depending on EUT > configuration (IEC 61000-4-20). ! > > From an European Assessor's point of view I had about 5 to 7 GTEMs/Labs > successfully assessed (accreditation scope e.g. CISPR 22 with GTEM and OATS > correlation procedure for certain EUTs) over the past 10 years all over the > EU, but mainly in Germany. > > 2.) Yes, as far as I know is the GTEM acceptable to FCC under certain > correlation demo efforts for a specific EUT type. The FCC was the first to > analyze that new GTEM technology at that time outside the EU. > > Does this hopefully not "biased" view help? > > Best regards > > Dr. Diethard Hansen > EES President, Principal Consultant, Trainer > US Senior NARTE certif. EMC Eng., NCE Prod. Safety > EMC+Automotive+Telecom QM+techn. EA-Auditor > -------------------------------------------- > Euro EMC SERVICE (EES) Dr.-Ing. D. Hansen > POB 64, Bahnhofstr.399, CH-8965 Berikon 2, > Switzerland, Swiss VAT (Mwst.)No.:323214 > -----------! --------------------------------- > tel./fax: +41 566 33 73 81 > German mobile phone: +49(0)1736015909 > www.euro-emc-service.de > [email protected] > ( mailto:[email protected]) > -------------------------------------------- > Consulting+Seminars+R&D-Projects > Marketing+CE-Testing+ww.Audits > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]]On Behalf Of itl-emc user group > Sent: Montag, 10. Januar 2005 16:09 > To: Emc-Pstc Group (E-mail 2) > Subject: EMC Radiated Emission Tests Using GTEM Cell > > > > Dear Colleagues, > > 1. Is a GTEM Cell or TEM Waveguide acceptable as an alternative test site > for full complia! nce radiated emission tests to CISPR 11/22? > > 2. If no t, is it expected to be acceptable in the future? (It is acceptable > by the FCC). > > Thanks in advance for any response. > > Regards > > Shaike Raz > EMC Laboratory Manager > EMC Laboratory > ITL (Product Testing) Ltd. > Kfar Bin Nun > Israel > Tel: +972-8-979-7799 > Fax: +972-8-979-7702 > Email: [email protected]/[email protected] > http://www.itl.co.il > http://www.i-spec.com > This e-mail message may contain privileged or confidential information. If > you are not the intended recipient, you may not disclose, use, disseminate, > distribute, copy or rely upon this message or attachment in any way. If you > received this e-mail message in error, please return by forwarding the > message and its attachments to the sender. > > > > -----------------------------! ----------------------------------- This > message is from the IEEE Product Safety Engineering Society emc-pstc >t; 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/listserv/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 Mcantwell [email protected] > > > For policy questions, send mail to: > > > Richard Nute: [email protected] Jim Bacher: [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 Produc t 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/listserv/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 Mcantwell [email protected] > > For policy questions, send mail to: > > Richard Nute: [email protected] > Jim Bacher: [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/listserv/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 Mcantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
