The Keysight N9925A-211 full two-port S-parameters option.A base vector network analyzer provides transmission / reflection or S21 and S11 measurement capabilities, along with one-port and enhanced response calibrations. To obtain all four S-parameters, forward and reverse (S11, S21, S12, S22) and full two-port calibration, option 211 should be ordered. Full two-port calibration is the most accurate calibration available with…The Keysight N9925A-211 full two-port S-parameters option.A base vector network analyzer provides transmission / reflection or S21 and S11 measurement capabilities, along with one-port and enhanced response calibrations. To obtain all four S-parameters, forward and reverse (S11, S21, S12, S22) and full two-port calibration, option 211 should be ordered. Full two-port calibration is the most accurate calibration available with FieldFox network analyzers.Option 211 also adds A/B and B/A measurement capabilities to the vector voltmeter mode, available as option 308. Read More