Ian, Interesting! I agree with you that temperature can't be the primary factor for the variation. If it is, we are all in big trouble...
I'd suggest some other items to check which may have occurred in the interim between tests: Easy: - Loose connections - Damaged cables More difficult: - Signal strength of reference source - Broken, cracked, or otherwise damaged ferrites or capacitors in the signal source and the LISN. When all else fails: - Send the receiver in for calibration I'd bet a donut that you'll find something like this has changed in your set-up between tests. Cheers, Marko From: ext Gordon,Ian [mailto:[email protected]] Sent: Monday, August 11, 2003 8:33 AM To: 'IEEE EMC-PSTC GROUP' Subject: Temperature effects on conducted emissions? All Can anyone suggest a means by which the indicated signal from a LISN + transient limiter + receiver combination can result in a 30dB change over one month? I used the same "reference source" and test configuration on both occasions to generate emissions. However, the source is merely a piece of standard equipment and not intended as a calibration reference. The temperature has varied considerably over the last month but I would not have thought this could result in a 30dB variation. Alternatively, can anyone suggest a means of constructing a reference source which may be connected to the LISN input? Thanks Ian Gordon _____________________________________________________________________ This e-mail has been scanned for viruses by MCI's Internet Managed Scanning Services - powered by MessageLabs. For further information visit http://www.mci.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
