As I understand it, an "AVG Detector" is just a 1st order, low-pass RC filter after the IF amp and detector.
The Video Averaging provided by the HP8568B and perhaps others, is a weighted average of successive video trace data. For a CW signal (a periodic waveform) the AVG and PK detectors should show the same amplitude. However, the AVG detector attenuates "incoherent" or non-periodic signals and the attenuation depends on the pulse rep rate. Ralph McDiarmid, ASc Compliance Engineering Group Xantrex Technology Inc. From: Brent DeWitt [mailto:bdew...@ix.netcom.com] Sent: December 18, 2004 8:02 PM To: Ken Javor; Ralph McDiarmid; ieee pstc list Subject: RE: Conducted Emissions PK/AVG Your point is well taken Ken, and this certainly is interesting. My approach to the concept of "average" does indeed run afoul of the limitations of measurement devices and the potential for instrument dependent results. To the best of my knowledge, the FCC is the most ill-defined with respect to the averaging time constant. That is what initially lead me to my stated empirical method. Other thoughts are welcomed! Brent 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 emc-p...@ieee.org Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc