Sent the following response on this last Friday: From: Ken Javor <[email protected]> Date: Fri, 30 Nov 2012 22:03:18 -0600 To: "[email protected]" <[email protected]> Conversation: MIL STD 461F RE103 Appendix A.5.18.3 Subject: Re: MIL STD 461F RE103 Appendix A.5.18.3
³Since the test procedure measures emissions radiating from an antenna connected to a controlled impedance, shielded, transmission line, the measurement results should be largely independent of the test setup configuration. Therefore, it is not necessary to maintain the basic test setup described in the main body of this standard.² This means that the standard layouts in Figures 2 4, as well as the use of a LISN and ground plane at all, don¹t apply. It doesn't hurt to use the standard set-up, but it isn¹t required. The reason for this, especially relative to RE103, is this. In many cases, RE103 cannot be performed in a MIL-STD-461-sized chamber. The EUT might have to be transported to a SAC or OATS not normally used for 461 measurements. There is no need, under these conditions, to try to replicate a 461 set-up in the specialized facility. To a lesser extent, the same could be true for CE106. The collection of notch, high and low pass filters might not be available at the typical EMI test facility, but the radio manufacturer would have this type of equipment, so it could make more sense to test in-house and farm out the standard tests to a commercial EMI test house. The manufacturer would then not need to have EMI test equipment around, just the rf test equipment he needs and already has. Ken Javor Phone: (256) 650-5261 From: "Airy, Chad" <[email protected]> Date: Sun, 2 Dec 2012 20:01:30 -0800 To: "[email protected]" <[email protected]> Conversation: MIL STD 461F RE103 Appendix A.5.18.3 Subject: MIL STD 461F RE103 Appendix A.5.18.3 The RE103 discussion under Test Procedures in Appendix A.5.18 (5.18), MIL-STD 461F, is somewhat puzzling to me. It states: ³Test procedures: Since the test procedure measures emissions radiating from an antenna connected to a controlled impedance, shielded, transmission line, the measurement results should be largely independent of the test setup configuration. Therefore, it is not necessary to maintain the basic test setup described in the main body of this standard.² Except for the receive antenna, the statement is quite similar to the corresponding statement in A.5.6 (5.6) CE106: ³Test procedures: Since the test procedures measure emissions present on a controlled impedance, shielded, transmission line, the measurement results should be largely independent of the test setup configuration. Therefore, it is not necessary to maintain the basic test setup described in the main body of this standard.² It is logical to reason that there is no need to ³maintain the basic test setup² when conducting CE106. There are no antenna¹s in the setup. Therefore chamber reflections are not an issue, so we expect the results to be independent from that standpoint. So I am apparently missing something. How could RE103 emissions measured in either a anechoic chamber or OATS be independent of the test setup configuration? What is really meant by ³the basic test setup described in the main body of this standard.²? And yes, I¹ve checked 461E, which reads essentially the same. Charles D. (Chad) Airy General Atomics Reconnaissance Systems Group 16868 Via Del Campo Court | San Diego, CA 92127 wk: 858.762.6853 | fax: 858.762.5081 - Charles D. (Chad) Airy General Atomics Reconnaissance Systems Group 16868 Via Del Campo Court | San Diego, CA 92127 wk: 858.762.6853 | fax: 858.762.5081 - ---------------------------------------------------------------- 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 <[email protected]> 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://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]>
