Keysight Technologies C Series - Average Count

Keysight N9915-90020 User’s Guide 205
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
— Noise Marker Averaging - Learn more in “Noise Marker” on page 215.
— Video BW filtering (for non-Zero Span measurements) - Learn more in
“Video Bandwidth (Video BW)” on page 188.
There are three types of mathematical averaging that can be performed – Log,
Linear, or Voltage (see
“How to set Average Type” on page 205). Select ONE
of these types and it is used for all of the above averaging processes.
How to set Average Type
1. Press Meas Setup 4 > Average Type [current setting]
2. 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 Averaging – Converts the amplitudes to a magnitude unit
before averaging (e.g., Volts, Amps, microVolts, milliVolts, etc.)
#VAvg annotation is displayed.
Average Count
The Average Count setting is used mainly with the Average Trace State
described in
“Trace Display States (SA Mode)” on page 203. 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
1. Press Meas Setup 4 > Average Count