Hans and John,
An H/P seminar handbook for the 8566/8568 states that "three
criteria must be met for average detection; 1: the video-filter bandwidth
must be 10-100 times less than bandwidth of the resolution filters and less
than the lowest pulse repetition frequency. 2: Linear amplitude display mode
must be used. and 3: the sweep time must be slow enough that the video
filters charge to their full amplitude values" I hope this helps!
Rocky
-)-(-
-----Original Message-----
From: Hans Mellberg [mailto:[email protected]]
Sent: Wednesday, September 08, 1999 10:32 AM
To: John Cronin; [email protected]
Subject: Re: Average Measurements above 1 GHz
There is somewhere a HP app note on how to perform CISPR average
measurements (by calculating the VBW vs frequency). It was written for
the 8566/8568 analyzers Its about 15 yrs old but someone on this list
should have it. I lost mine and I don't recall the exact title. What I
do, is to use a VBW of 3Hz at 0 span. That seems to correlate with the
8546's built in average detector.
Hans
--- John Cronin <[email protected]> wrote:
>
> Now that we can carry out measurements at 3m I have
> another question. How
> to perform average measurements above 1 GHz.
>
> Most analyzers do not appear to have a specific
> CISPR compliant average
> function. So how is the average measurement carried
> out?
>
> Use of the average detector could yield a few dB
> lower levels even for a
> narrowband emission.
>
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