Agilent Technologies N5230A, Service Manual, Page: 43 / 262

Service Guide N5230-90014 3-13
PNA Series Microwave Network Analyzers Tests and Adjustments
N5230A Preliminary Checks
Cable Return Loss Check
1. Press 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. From the Marker menu, click Marker Search . In the Marker Search dialog box, in the
Search 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.