Bob When Don demonstrated this, was the measurement done with the QP detector engaged or was it using peak detector? Best regards, Mac Elliott
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Bob Richards Sent: Thursday, March 01, 2007 7:39 AM To: [email protected] Subject: Re: Radiated Emission Question Tim, CISPR 16-2 ed 1.2 2002-10, section 2.3.4.1 "If the level of disturbance is not steady, the reading on the measuring receiver is observed for at least 15 s for each measurement; the highest readings shall be recorded, with the exception of any isolated clicks, which shall be ignored. (see 4.2 of CISPR 14)." Clicks, or discontinuous disturbances, are defined in CISPR 14. There is similar wording in ANSI, something to the effect that an instrument capable of sweeping must be set to zero span mode to take a measurement. (I can't seem to place my hands on that at the moment, however). Don Heirmann, a widely recognized EMC expert visited a lab where I worked and gave a talk about EMC regulations. This was one of the items brought up. Zero span, dwell for 15s, take the max level observed as the measurement. I hope this helps. Cheers, Bob Richards, NCT. [email protected] wrote: Hello, I have a question regarding radiated emission testing where a peak is not constant. The peak in this case comes in for about 5-6 seconds, then off for a few seconds and back in again. This is a peak generated by the EUT, which is an ITE device. The question is, should the lab take the maximum peak, or just skip the reading because it is random. I have verified it is from my equipment. The problem is this particular reading is failing. I have been told by some that the reading needs to be taken and some say that reading should be omitted from my test data. I welcome any suggestions on how to handle this. I do not want to spend unnecessary time debugging if I don’t need to. Please reference any particular paragraphs in the ANSI or CISPR standards to back up the answer, because I will need to justify this to the engineering team. Thanks, Tim Pierce _____ AOL now offers free email to everyone. Find out more about what's free from AOL at <http://pr.atwola.com/promoclk/1615326657x4311227241x4298082137/aol?redir=http%3A%2F%2Fwww%2Eaol%2Ecom> AOL.com. ************************************** AOL now offers free email to everyone. Find out more about what's free from AOL at http://www.aol.com. - ---------------------------------------------------------------- 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 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 ______________________________________________________________________
