Amund, What you need to do is to split the band into 100 MHz segments. In each segment, use a "fast scan" on a spectrum analyser in peak detector mode. The sweep time should the minimum possible - approx 100 ms (which probably means the sweep-and-flyback time is less than 150 ms). Use Max Hold and dwell for several minutes in this band. Select frequencies of interest and then re-measure these with a QP detector over several minutes each. This approach guarantees that you will not miss any events that are longer than the peak-and-flyback time that happen within the time that you wait for each Max Hold segment. If there are any intermittent events shorter than the peak-and-flyback time, they will probably be insignificant when measured with a QP detector anyway. (And CISPR 14 disregards clicks shorter than 200 ms anyway). Best Regards, Luke Turnbull Dr Luke Turnbull EMC Technical Manager TRW Conekt Stratford Road Solihull West Midlands B90 4GW
Tel: +44 (0)121.627.3966 Mobile: +44 (0)7730.671284 Fax: +44 (0)121.627.4353 email: [email protected] web: www.conekt.net >>> "Amund Westin" <[email protected]> 04 December 2008 10:56 >>> When doing Radiated emission 30-1000 MHz according to EN55022, for hold long time do you measure at each frequency (band)? Best regards Amund - 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]> Conekt is a trading division of TRW Limited Registered in England, No. 872948 Registered Office Address: Stratford Road, Solihull B90 4AX - 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]>
