Keysight N9923-90001 User’s Guide39NA (Network Analyzer) ModeNA Mode SettingsNA Mode SettingsSelect NA Mode before making any setting in this chapter.How to select NA Mode— Press Mode.— Then NA.About S-parametersS-parameters (scattering parameters) are used to describe the way a devicemodifies a signal. The FieldFox can measure four S-parameters. The syntax foreach parameter is described by the following:S (out | in)out = FieldFox receiver portin = FieldFox source portThe FieldFox automatically switches the internal source and receivers to makeboth forward and reverse measurements. Therefore, the FieldFox can measureall four S-parameters with a single connectionWhen the source comes from port 1, the measurement is said to be in theforward directionWhen the source comes from port 2, the measurement is said to be in thereverse directionS11 and S22 reflection measurements are used to measure the amount ofreflections off the corresponding DUT port. Low reflections means there is agood impedance match between the source and DUT.
