Na Mode Settings; How To Measure S-Parameters - Keysight N9923A FieldFox User Manual

NA Mode Settings

Select NA Mode before making any setting in this section.
How to select NA Mode
 Press Mode_.
 Then NA.
About S-parameters
S-parameters (scattering parameters) are used to describe the way a device modifies
a signal. The FieldFox can measure four S-parameters. The syntax for each
parameter is described by the following:
The FieldFox automatically switches the internal source and receivers to make both
forward and reverse measurements. Therefore, the FieldFox can measure all four S-
parameters with a single connection.
When the source comes from port 1, the measurement is said to be in the forward
direction.
When the source comes from port 2, the measurement is said to be in the reverse
direction, which requires Option 122.
S11 and S22 reflection measurements are used to measure the amount of reflections
off the corresponding DUT port. Low reflections means there is a good impedance
match between the source and DUT.
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
2. Press Measure 1 then choose from the following:
NA (Network Analyzer) Mode
S (out | in)
out = FieldFox receiver port
in = FieldFox source port
Preset
Reflection measurement at port 1.
S11
o
Forward 2-port transmission measurement.
S21
o
Reverse 2-port transmission measurement. Requires Opt 122.
S12
o
Reflection measurement at port 2. Requires Opt 122.
S22
o
21