Agilent Technologies ESA Series User's/Programmer's Reference page 59

Negative Peak
Accesses the functions to automatically or manually choose from one of
Avg Type
the following averaging scales: Video or Power (RMS).
Auto Man
If video averaging is selected, the measurement results are the average
NOTE
of the signal level in the y-axis scale. If the power average (RMS) is
selected, all measured results are converted into power units before
averaging and filtering operations, and converted back to decibels for
displaying. The main point to remember is that there can be significant
differences between the average of the log of power and the log of the
average power.
There are actually four types of averaging processes within a spectrum
analyzer. All, except VBW filtering, are affected by this setting. They
are:
• Trace averaging (see
Averages signal amplitudes on a trace-to-trace basis. (The type of
averaging (Video or Power (RMS)) is selected by pressing
Avg Type
• Average detector (see
Averages signal amplitudes during the time or frequency interval
represented by a particular measurement point. The method is
determined by selection of either Video or RMS.
• Noise Marker (see
Averages signal amplitudes across measurement points to reduce
variations for noisy signals.
• VBW filtering.
Filtering the video is a form of averaging the video signal.
When trace average is on (
shown on the left side of the display. When
the analyzer chooses the type of averaging to be used as shown in
Figure
Chapter 2
appears in the upper-left corner of the display.
Key Access:
Auto Couple, Detector Auto Man
Negative peak detection functions the same as peak
detection, but selects the minimum video signal value.
This detection should not be used to make the most
accurate amplitude measurements of signals. When
Negative Peak
upper-left corner of the screen.
Key Access:
Auto Couple, Detector Auto Man
BW/Avg
.)
Det/Demod
,
Marker
BW/Avg
2-2. When one of the average types is selected manually, the
is selected, NPeak appears in the
, ).
Average (On)
,
Detector, Average (Video/RMS)
)
Noise
, , the Average Type is
Average (On)
Avg Type (Auto)
Front-Panel Key Reference
Auto Couple
,
BW/Avg
).
is selected,
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