3-14 Keysight N5221A/22A Service Guide
Tests and Adjustments
Preliminary Checks
3-
If the Operator’s Check Fails
1. Clean the test ports, shorts, and adapters. Torque to specification. Repeat
the check.
2. If the check still fails, suspect a faulty component. Refer to “Measurement
System Troubleshooting” on page 4-28 to begin troubleshooting to
determine the faulty component.
The Test Port Cable Checks
A faulty test port cable can cause a failure in the verification test. The following
checks are not required, but are recommended to verify the performance of the
test port cable.
— “Cable Return Loss Check” on page 3-14
— “Cable Insertion Loss Check” on page 3-15
— “Cable Magnitude and Phase Stability Check” on page 3-17
— “Cable Connector Repeatability Check” on page 3-19
Accessories Used in the Test Port Cable Checks
Cable Return Loss Check
3. Press UTILITY .
4. Perform a one-port calibration on Port 1, 1-Port Reflection. Refer to the
embedded help in the analyzer if necessary.
5. 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.
6. 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.
7. 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.
Equipment Type Model or
Part Number
Alternate Model
or Part Number
Calibration kit, 3.5 mm 85052B 85052D
Test cable, 3.5 mm (f) to 3.5 mm (f) 85131C 85131E
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