Keysight Technologies N52 Series User's And Service Manual page 49

Installation & System Operation
Figure 1-29
5. Measure a Thru Connection.
S12 requires a Transmission/Reflection module on Port 1.
S21 requires a Transmission/Reflection module on Port 2.
S34 requires a Transmission/Reflection module on Port 3.
S43 requires a Transmission/Reflection module on Port 4.
44
Banded System Check
a. Connect the Port 1 to Port 2 module, and Port 3 to Port 4 module
(N5262A) to form thru connections.
b. Delete the trace 1, S11. Select Trace/Chan > Trace > Delete Trace.
c. Select [Preset] > Trace/Chan >Trace > New Trace. Select S12, S21,
S34 and S43. This test confirms that the modules are sourcing and
receiving. Refer to your millimeter-wave modules data from OML or
VDI, included with the your module.
Keysight N5261/62A User's & Service Guide