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NOTE
Trace 4 data WILL be overwritten by the FieldFox when using the Independent
Source Normalize feature (page 69) or using Field Strength antenna or cable
corrections (page 66).
Averaging Type
In SA Mode, there are four different processes in which Averaging is performed:
Trace Averaging
Detection Method Averaging
Noise Marker Averaging
Video BW filtering (for non-Zero Span measurements)
There are two types of mathematical averaging that can be performed. Select
ONE of these types and it is used for all of the above averaging processes.
How to set Averaging Type
Press Meas Setup 4
Then choose from the following:
Trace Averaging
Trace Averaging helps to smooth a trace to reduce the effects of random noise on
a measurement. The FieldFox computes each data point based on the average of
the same data point over several consecutive sweeps.
SA (Spectrum Analyzer) Mode
(Clear/Write) Displays the actual measured data for each sweep.
Clr /Wr
o
Displays the maximum response of the input signal over multiple
MaxHold
o
sweeps.
Displays the minimum response of the input signal over multiple
MinHold
o
sweeps.
Average
Each data point is averaged over multiple sweeps as set by the
o
Average Count setting. Learn more in following Trace Averaging section.
Displays and then holds the last complete measurement trace on the
View
o
screen.
Displays no trace.
Blank
o
to return all traces to their default settings: Trace 1
Default All
(Clear/Write); all other traces (Blank).
- The FieldFox chooses the most appropriate type of averaging for the
Auto
o
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.
Averaging – Best for displaying Trace Averaging. LgAv is shown on the
Log
o
left side of the FieldFox screen when selected.
(Linear) Averaging – Best for measuring true power levels. Used in
Power
o
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.
79
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