Service Guide N5227-90001 3-13
PNA Series Microwave Network Analyzers Tests and Adjustments
N5227A Preliminary Checks
Cable Return Loss Check
1. Press UTILITY .
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 , then . 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.
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