Keysight N5227A Service Manual page 37

PNA Series Microwave Network Analyzers
N5227A
Cable Return Loss Check
1. Press UTILITY
Preset
2. Perform a one-port calibration on Port 1, 1-Port Reflection. Refer to the embedded help in the analyzer if
necessary.
3. Connect the test port cable to Port 1. Connect a broadband load to the other end of the cable. Tighten to
the specified torque for the connector type.
The analyzer now displays the return loss of the cable.
4. Press MARKER/ANALYSIS
Type box, make sure Maximum is selected. Click Execute, and then click OK.
5. The marker annotation on the screen indicates the worst case return loss. Refer to the cable manual to
see if it meets the return loss specification. For an example of a typical return loss measurement,
see Figure 3-4.
Figure 3-4 Typical Cable Return Loss Response
If the Cable Return Loss Check Fails
1. Clean the cable and devices and torque to specification. Repeat the check.
2. If the check still fails, the cable should be repaired or replaced.
Service Guide N5227-90001
.
Search , then
Search
. In the Marker Search dialog box, in the Search
Tests and Adjustments
Preliminary Checks
3-13