This borders on an ethical question, not a technical one. What "due diligence" are we required to exercise? My answer as always been: enough. Pretesting is SMART. Something that a few standard rate scans might miss, might instead be found in the field by a customer, or (God forbid) by way of an incident. It might better be found by thorough internal testing, and fixed. Not that there's an excuse for missing something; we know what the emitters are, do we not? I think its not a good idea, it's a GREAT idea. Cortland KA5S
----- Original Message ----- From: Luke Turnbull <mailto:[email protected]> To: [email protected] Sent: 3/21/2007 10:57:41 AM Subject: Radiated Emissions pre-scans for Aerospace / Military / AutomotiveStandards. Hello emc-pstc'ers, I have an EMC question about military / aerospace / automotive emissions standards. I hope I can get a wide / global answer to how standards 1. should be interpreted and 2. are interpreted when performing a test. It has been suggested that we as a test lab should perform "pre-scans" when making emissions measurements of a product. The purpose is to ensure that any intermittent emissions will be captured and that it should involve the use of max hold on a spectrum analyser with fast sweeps to ensure all frequencies are revisited many times a second for at least 20 seconds in each span. For each of: DO-160, MIL STD 461, CISPR 25 1. Do people believe the standard requires such a pre-scan? 2. Are test labs worldwide actually performing such a pre-scan? Thanks for your help, Luke Turnbull - ---------------------------------------------------------------- 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/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ - ---------------------------------------------------------------- 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/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
