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 TEM 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.39, CH-8965 Berikon 2, Switzerland, Swiss VAT (Mwst.)No.:323214 tel./fax: +41 566 33 73 81 German mobile phone: +49(0)1736015909 <http://www.euro-emc-service.de> www.euro-emc-service.de <mailto:[email protected]> [email protected] ( <mailto:[email protected]> mailto:[email protected]) Consulting+Seminars+R&D-Projects Marketing+CE-Testing+ww.Audits 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 compliance radiated emission tests to CISPR 11/22? 2. If not, 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.itl.co.il> http://www.i-spec.com <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 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
