Instrument Configuration3Keysight U8903A User’s Guide91Output impedanceThe output impedance can be selected as follows.Balanced and Common mode: 100Ω, 600ΩUnbalanced: 50Ω, 600ΩReference impedanceThe reference impedance can be set as shown in the figure below. The impedanceis used for conversion of the measurement result in unit W or dBm.Figure 3-18Reference impedance