We use a USB to STP-cable convertor to take the computer out of the test room.
Depending on the test levels required, the inside part will have to be shielded. Take the electronics outside the box and make a shielded box, add A LOT of filters at both sides. I have been able to test USB equipment to the requirements of BMW automotive requirements ( < 10 dBuV/m), while transferring a 1Gigabyte video file over the link. Regards, Ing. Gert Gremmen, BSc Van: Doug Powell [mailto:[email protected]] Verzonden: Wednesday, October 16, 2013 6:17 AM Aan: [email protected] Onderwerp: Re: [PSES] Test computers Am I missing something (always possible). Is the test computer in the RF test field or outside the test field? If only required for the test setup and not part of the device under test and you are doing radiated emissions and immunity, a long I/O cable with a bunch of ferrite and / or a decoupling network should take the computer out of the picture entirely. If doing conducted emissions and immunity, powering from a filtered source should be enough. If doing immunity on the I/O ports, you may need a really good CDN. I have had occasion where a laptop which was not the DUT failed the testing and we could not continue until corrected. Otherwise I am unaware of a regulatory restriction on their use for testing. Thanks, - doug Douglas Powell http://www.linkedin.com/in/dougp01 From: McInturff, Gary Sent: Tuesday, October 15, 2013 5:19 PM To: [email protected] Reply To: McInturff, Gary Subject: [PSES] Test computers I’m looking at updating my computer for EMC testing. In this case the computer is the support equipment rather than the host. Beyond just finding a “quiet” computer I would like to know if there is any reason under ANSI C 64 or CISPR 22 etc that would prohibit me from buying an all-in-one computer. Essentially the monitor is included inside the same housing that also contains the actual processor and mother board. I still have the various USB and Video outputs such as HDMI. So I still hook up keyboards and USB devices – in most cases the USB device is my actual test article. The benefit is simply that I don’t have to play around with a separate monitor and it’s cabling and associated noise. I had been advised against once by a test facility when I suggested I was going to move from a desktop to a laptop to try and minimized the test platform. I’m not sure why it would be prohibited or if they are actually correct. I can’t find a reason behind it other than the antiquated test setups currently identified in the standards. Has anyone else run into an actual prohibition? Laptops themselves being the glaring exception to the standard test setup. Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur Avenue Coeur d’Alene, ID 83815-9496 Toll Free: 800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 www.esterline.com/interfacetechnologies Technology, Innovation, Performance… "Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me." Click here <http://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspx> to read disclaimer - ---------------------------------------------------------------- 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.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) <http://www.ieee-pses.org/list.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.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) <http://www.ieee-pses.org/list.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.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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
