And more importantly, why should it be ignored, especially if it’s coming >from the EUT?
This term is a remnant from at least CISPR 22:1997. We should all have an understanding of the descriptor “brief isolated”, but we do not know the applicable defined conditions of this subjective term (cyclic, random, single occurrence, how high is high, how brief is brief, how isolated is isolated, etc?) or the mindset of the standard writers when it was first introduced. If not defined in the standard or specifically referenced to somewhere else and due its subjective nature, “brief isolated” is certainly left to interpretation. Comments? Maybe the CISPR 22 standards writers could interject. Best regards, Ron Pickard [email protected] <mailto:[email protected]> From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, February 11, 2009 10:07 AM To: [email protected] Subject: Brief and Isolated In Clause 6.1 of EN55022:2006 A1:2007 it states: "The EUT shall meet the limits of Table 5 or Table 6 when measured at the measuring distance R in accordance with the methods described in Clause 10. If the reading on the measuring receiver shows fluctuations close to the limit, the reading shall be observed for at least 15 s at each measurement frequency; the highest reading shall be recorded, with the exception of any brief isolated high reading, which shall be ignored." Does anyone know what "brief isolated" could mean or am I left to my own to devices to define it as I see fit? Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 - 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]>
