Keysight N9923A, User Manual, Page: 80 / 276

80 Keysight N9923-90001 User’s Guide
CAT (Cable and Antenna Test) Mode
CAT Mode Settings
— Ref Level Manually set the value of the reference line.
Enter a negative 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 between 0 (TOP line) and 10
(BOTTOM line)
3. Set Top and Bottom graticule values. The scale per division is
calculated.
— Top to set the value of the Top graticule.
— Bottom to set the value of the Bottom graticule.
— Enter a negative value by pressing Run/Hold (+/-) either
before or after typing a value.
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.
How to set Trace Averaging
— Press
BW 2
.
Scale annotation on the FieldFox screen
Reference Line = red arrow
Ref Level = -40 dB
Ref Position = 1
Scale = 2 dB per division
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 in “Increase Dynamic
Range” on page 58
.