Employer recently had me do a widget for connect to computer via USB, and comes with canned software driver (no API). EMC labs give me lots of trouble. The first test house said No, so I said 'bye' and took it down the road to another, where they wrote almost a full page on the test conditions. Have settled on a single 'representative' computer - a somewhat older Lenovo (2011) Thinkpad. Do not know if emissions or immunity are any better or worse than other boxes, but what can be reasonably expected?
IAC, how can an external widget maker control the various combinations of keyboards, monitors, rat, and coffee cup heaters attached to the 10E6 types of mother board/chip set/OS combos? I say let them eat cake, or burritos... Would also like to hear from some senior EMC people employed at test labs for the FCC and CISPR interpretations on this mess. Brian From: McInturff, Gary [mailto:[email protected]] Sent: Tuesday, October 15, 2013 4:18 PM To: [email protected] 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 - ---------------------------------------------------------------- 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]>
