Keysight N9923-90001 User’s Guide 171VVM (Vector Voltmeter) Mode - Option 3082-Port Transmission Measurements2-Port Transmission MeasurementsA 2-Port Transmission measurement is used for measuring electrical length,insertion loss, gain, or isolation of a DUT at a single CW frequency. TheFieldFox signal source is transmitted out the port 1 connector, through theDUT, and into the port 2 connector. In the following image, the gain of anamplifier is being measured.Figure 11-3 2-Port Transmission measurement of an amplifierHow to make a 2-Port Transmission Measurement1. Press Mode then VVM then 2-Port Transmission.2. Press Freq/Dist and enter the measurement frequency.3. Press Meas Setup 4 then More then Output Power. Select High for passivedevices. Select Low for amplifiers.4. Calibrate the FieldFox using one of the methods described in “VVMCalibration” on page 167. Before performing a QuickCal or MechanicalCal, press Meas Setup 4 then Zero OFF.5. Connect the DUT.Notes:— The magnitude value is the gain (positive value) or the loss (negative value)of the DUT.— The phase value is the difference in phase (in degrees) between the DUTinput and output.— To measure isolation of the amplifier, reverse the connection to the amplifier(PORT 1 to the amplifier output).
