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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
• Average detector (see
• Noise Marker (see
• VBW filtering.
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 2-2 on page
manually, the analyzer uses that type without regard to the other
analyzer settings and sets
Key Access:
Video Avg
Pwr Avg
Chapter 2
Averages signal amplitudes on a trace-to-trace basis. (Press Video or
Power (RMS) when
Avg Type (Man)
Averages signal amplitudes during the time or frequency interval
represented by a particular measurement point.
Marker
Averages signal amplitudes across measurement points to reduce
variations for noisy signals.
Filtering the video is a form of averaging the video signal.
71. When one of the average types is selected
BW/Avg
Video averaging averages the data as appropriate for
the y-axis scale. When
VAvg appears on the left side of the analyzer display if
Average
Key Access:
Power averaging is performed by converting the trace
data from logarithmic to linear power units, and then
averaging the power trace data. When
is selected, PAvg appears on the left side of the
Avg
analyzer display if
Key Access:
).
BW/Avg
is selected.)
,
).
Detector
Average
,
)
Noise
,
BW/Avg
Average (On)
Avg Type (Auto)
to
.
Avg Type
Man
Avg Type
is On.
,
BW/Avg
Avg Type
is On.
Average
,
BW/Avg
Avg Type
Front-Panel Key Reference
BW/Avg
, the Average Type is
is selected,
,
is selected,
Video Avg
,
Avg Type
Pwr
75
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