Keysight N9938-90003 User’s Guide 41
CAT (Cable and Antenna Test) Mode
CAT Mode Settings
— Left The Settings table is shown to the left of the trace window
— Bottom The Settings table is shown below the trace window
— When finished changing ALL settings, press Done
to save your settings
Frequency Range
Set the range of frequencies over which you would like to make CAT Mode
measurements
When the frequency range is changed after a calibration is performed, the cal
becomes interpolated. Learn more in “Interpolation *” on page 103.
How to set Frequency Range
—Press Freq/Dist.
— Then choose from the following
— Start
and Stop frequencies - beginning and end of the sweep.
— Center
and Span frequencies – the center frequency and span of
frequencies (half on either side of center).
— Follow each setting by entering a value using the numeric keypad,
arrows, or the rotary knob.
— After using the keypad, select a multiplier key. Learn about multiplier
abbreviations in Chapter 1, “Overview.”
— After using the arrows or the rotary knob, press Enter
. The
amount of frequency increment is based on the current span and can
NOT be changed in CAT Mode.
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. Autoscale
Automatically adjusts the Y-axis to comfortably fit the
Minimum and Maximum amplitude of the trace on the screen.
2. Set Scale, acquisition, and Reference Position:
— Scale
Manually enter a scale per division to view specific
areas of the trace
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