[TenTec] Effect of roofing filter selection on Orion II NB

[Bill Tippett]

I wrote:

 >Grant, I don't believe the 331A is True RMS.

         My memory is correct!

"The Agilent 331A uses the average-responding detector. This type of 
detector is calibrated to indicate the rms value of a signal (1.11 
times the average value of the rectified waveform). However, this 
gives a true rms value only when the signal is a pure sine wave. When 
the signal is a complex waveform, or when noise is present, the 
average detector almost always reads lower than a true rms detector. 
With noise or harmonics present, the ratio of true rms to average is 
no longer the same. "

http://www.home.agilent.com/cgi-bin/pub/agilent/library/cp_LibraryFAQDetail.jsp?NAV_ID=-536895247.536881790.02&LANGUAGE_CODE=eng&CONTENT_KEY=1000003165%3aepsg%3afaq&ID=1000003165%3aepsg%3afaq&COUNTRY_CODE=US

                                 73,  Bill  W4ZV