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Follow each setting by entering a value using the numeric keypad, ▲|▼
Scale Settings
Adjust the Y-axis scale to see the relevant portions of the data trace. The Y-axis is
divided into 10 graticules.
This setting can be changed at any time without affecting calibration accuracy.
How to set Scale
Press Scale / Amptd .
Then choose from the following three methods:
1.
2. Set Scale, Reference Level, and Reference Position:
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.
22
arrows, or the rotary knob.
After using the keypad, select a multiplier key. Learn about multiplier
o
abbreviations on page 18.
After using the ▲|▼ arrows or the rotary knob, press Enter. The amount of
o
frequency increment is based on the current span and can NOT be changed
in CAT Mode.
Automatically adjusts the Y-axis to comfortably fit the Min and
Autoscale
Max amplitude of the trace on the screen.
Manually enter a scale per division to view specific areas of the trace.
Scale
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
to set the value of the Bottom graticule.
Bottom
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
N9912A FieldFox User's Guide
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