66 Keysight N9938-90003 User’s Guide
NA (Network Analyzer) Mode
NA Mode Settings
S21 and S12 transmission measurements are used to measure the loss or gain
through a DUT over a specified frequency range. Both ends of the DUT must be
connected to the FieldFox. The FieldFox signal source is transmitted out one of
the test port connectors, through the DUT, and into the other test port
connector
How to measure S-parameters
1. Press Preset then Mode Preset (Factory)
2. Press Measure 1 then choose from the following:
— S11
Reflection measurement at port 1.
— S21
Forward 2-port transmission measurement.
— S12
Reverse 2-port transmission measurement. May require an
option.
— S22
Reflection measurement at port 2. May require an option.
OR select a multi-trace configuration. Learn more on “Multi-Trace
Configurations” on page 69
3. Press Freq/Dist
then either Start and Stop or Center and Span to enter a
Frequency Range for the measurement.
4. Press BW 2
then IFBW to select the IF Bandwidth for the measurement.
Narrower bandwidths require more time to sweep, but lowers trace noise.
5. Press Sweep 3
then Resolution to select the number of data points for the
measurement. More data points require more time to sweep.
6. Press Cal 5
to calibrate the measurement. Learn more in “How to Perform
a Calibration” on page 89.
7. All other settings can be made AFTER calibration without compromising
measurement accuracy.
Mixed-Mode S-Parameters
In NA Mode ONLY, mixed-mode S-parameters (also known as Balanced
measurements) are available with Option 212.
Because the FieldFox has only two test ports, only reflection measurements are
available. Connect the balanced input or output of your DUT to the FieldFox
ports 1 and 2
For highest accuracy, a Full 2-port calibration is required.
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