Agilent Technologies FieldFox N9913A User Manual page 24

3. Set Top and Bottom graticule values. The scale per division is calculated.
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.
Average Count determines the number of sweeps to average; the higher the
average count, the greater the amount of noise reduction.
An average counter is shown in the left edge of the screen as Avg N. This shows
the number of previous sweeps that have been averaged together to form the
current trace. When the counter reaches the specified count, then a 'running
average' of the last N sweeps is displayed. Average Count = 1 means there is NO
averaging.
This setting can be changed at any time without affecting calibration accuracy.
NOTE Averaging is often used to increase the dynamic range of a measurement. To
achieve the highest dynamic range, select NA mode and reduce the IF Bandwidth
setting. Learn more about dynamic range on page 51.
How to set Trace Averaging
 Press BW 2 .
 Then
 Enter a value using the numeric keypad. Enter 1 for NO averaging.
 Press Enter.
 While Trace Averaging is in process, press Sweep 3 then
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Scale
Manually enter a scale per division to view specific areas of the trace.
o
Ref Level
Manually set the value of the reference line. Enter a negative
o
value by pressing Run/Hold (+/-) either before or after typing a value.
Ref Position
Manually set the position of the reference line. Values must be
o
between 0 (TOP line) and 10 (BOTTOM line)
Top
to set the value of the Top graticule.
o
Bottom
to set the value of the Bottom graticule.
o
Enter a negative value by pressing Run/Hold (+/-) either before or after
o
typing a value.
Scale annotation on the FieldFox screen
· Reference Line = red arrow
·Ref Level = -40 dB
· Ref Position = 1
· Scale = 2 dB per division
Average N
where N is the current count setting.
the averaging at 1.
Restart
to restart
FieldFox User's Guide