Keysight Technologies N5252A User Manual page 40

Port 1 systems will show Port 2 selections. Do not select Port 2 in a calibration if
the system is configured for a 1 Port system. If the traces are selected for Port 2,
measured values will be invalid (-200 dB). Only reflection measurements are valid
for the 1 Port system. Thru measurements require Port 2, which will not be
functional. Refer to Figure 30 below.
Figure 30 1-Port System Calibration
Unselect
Port 2
40 N5252-90002 User's Guide