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Front-Panel Key Reference
Auto Couple
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
• Average detector (see
• Noise Marker (see
• VBW filtering.
70
Key Access:
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:
Averages signal amplitudes on a trace-to-trace basis. (The type of
averaging (Video or Power (RMS)) is selected by pressing
.)
Avg Type
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.
Marker
Averages signal amplitudes across measurement points to reduce
variations for noisy signals.
Filtering the video is a form of averaging the video signal.
Auto Couple, Detector Auto Man
is selected, NPeak appears in the
Auto Couple, Detector Auto Man
,
BW/Avg
Average (On)
,
Det/Demod
Detector, Average (Video/RMS)
,
)
Noise
).
BW/Avg
).
Chapter 2
,
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