Agilent Technologies N5241A, Руководство по обслуживанию

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3-14 Service Guide N5242-90001
Tests and Adjustments PNA Series Microwave Network Analyzers
Preliminary Checks N5241A/42A
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.
Preset
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