It depends if you want to do : 1/ measure the emissions of EUT 2/ perform a compliance test according to the standard,
1. Unless you are sure about the AE emissions, move it outside the room. You want to make a test on the EUT, not on AE !!! I never truly understood the EN 55022 table approach that seems to be written for desktop PC only (especially the drawings make no sense most of the time) and ignores the developments in CISPR16 regarding test volumes and cabling lay-out during testing. STP cable can be used to protrude the rooms walls on connection to the screen with any suitable screened bulkhead connector. UTP cable requires ferrites and preferably a quadruple CM coil sold for this purpose. They are small enough to be mount into a DB9 connector shell, and I use one inside and one outside the wall (plus ferrites). This gives more than acceptable results, even on 100M Note that the UTP cable in the room will emit the data transferred if the EUT-side has any imperfect balance. Perfectly balanced EUT will show almost no cable radiation. To see the data, special software may be required to get enough data traffic. You may apply a ISN after the required exposure length to prevent any excess lengths from radiating. 2. If you are required to perform compliance tests however, you will have to stick to EN 55022 and place the AE on the table next to EUT :<(((( Regards, Ing. Gert Gremmen ce-test, qualified testing bv Van: [email protected] [mailto:[email protected]] Namens [email protected] Verzonden: donderdag 20 november 2008 19:28 Aan: [email protected] Onderwerp: Testing products with network cables Good morning, I need to perform radiated emissions tests on a product with ethernet cables, but I'm not sure what the test setup should be. The equipment being tested needs an ethernet connection to auxiliary equipment (AE) that is not a part of the test. I seem to remember discussions on the list a few years ago concerning routing ethernet cables out of the test area, and isolating them using ferrite cores. However, after looking at the radiated test setup shown in EN55022:2006+A1:2007, I don't see references to cables leaving the test area. 1) Does the AE have to be in the test area, or can it be moved away? 2) If it is moved out of the test area, does the cable need any ferrite cores or ISNs? I'd appreciate pointers to the relevant clauses. Thanks, Pat Lawler EMC Engineer SL Power Electronics Corp. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]>
