Keysight N9938-90003 User’s Guide 143
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
— Noise Marker Averaging - Learn more in “Noise Marker” on page 154.
— Video BW filtering (for non-Zero Span measurements) - Learn more in
“Video Bandwidth (Video BW)” on page 128.
There are three types of mathematical averaging that can be performed – Log,
Linear, or Voltage (see “Average Type” on page 142). Select ONE of these
types and it is used for all of the above averaging processes.
How to set Average Type
—Press Meas Setup 4 then Average Type [current setting]
— Then choose from the following:
—Auto
- The FieldFox chooses the most appropriate type of averaging
for the current settings. When Detection Method is set to Average, a
Noise Marker is present, or a Channel measurement is active, then
Power Average is ALWAYS selected. Otherwise, Log Average is
selected.
—Log
Averaging – Best for displaying Trace Averaging. LgAv is shown on
the left side of the FieldFox screen when selected.
—Power
(Linear) Averaging – Best for measuring true power levels. Used
in Detection Average and Noise Marker Average. Mathematically,
trace noise is 2.5 dB higher than when using Log Average. PAvg is
shown on the left side of the FieldFox screen when selected.
—Voltage
Average Count
The Average Count setting is used mainly with the Average Trace State
described above. In this Trace State, the Average Count setting determines the
number of sweeps to average. The higher the average count, the greater the
amount of noise reduction.
When Trace (display) State is set to Average, MaxHold, or MinHold, the
average counter is shown in the left edge of the screen below the Average
Type.
For all three of these Trace States, when Sweep 3
Continuous is set to OFF,
press Restart
to reset the sweep count to 1, perform <n> sweeps, then return
to Hold.
How to set Average Count
—Press Meas Setup 4
—Then Average Count
— Enter a value from 1 to 10,000 using the numeric keypad, the arrows,
or the rotary knob.
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