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


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