The Test Port Cable Checks - Keysight Technologies N5221A Service Manual

Tests and Adjustments
Preliminary Checks
If the Operator's Check Fails
1. Clean the test ports, shorts, and adapters. Torque to specification. Repeat
2. If the check still fails, suspect a faulty component. Refer to

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.
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Accessories Used in the Test Port Cable Checks
Equipment Type
Calibration kit, 3.5 mm
Test cable, 3.5 mm (f) to 3.5 mm (f)
Cable Return Loss Check
3. Press UTILITY
4. Perform a one-port calibration on Port 1, 1-Port Reflection. Refer to the
5. Connect the test port cable to Port 1. Connect a broadband load to the
6. Press MARKER/ANALYSIS
7. The marker annotation on the screen indicates the worst case return loss.
3-14
the check.
System Troubleshooting" on page 4-28
determine the faulty component.
"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
Preset
embedded help in the analyzer if necessary.
other end of the cable. Tighten to the specified torque for the connector
type.
The analyzer now displays the return loss of the cable.
dialog box, in the Search Type box, make sure Maximum is selected. Click
Execute, and then click OK.
Refer to the cable manual to see if it meets the return loss specification.
For an example of a typical return loss measurement, see
to begin troubleshooting to
Model or
Part Number
85052B
85131C
.
, then
Search Search
Keysight N5221A/22A Service Guide
"Measurement
Alternate Model
or Part Number
85052D
85131E
. In the Marker Search
Figure 3-4.