Troubleshooting Test Failures

If a test will not proceed, then suspect either the setup is incorrect, or the test equipment or DUT is faulty. Specifically you should:

• Compare your test connections with the test setup on the computer screen.

• Ensure the cables and adapters are correct and not damaged.

• Check the output and input connectors on the test equipment for damage.

• Check for error messages on the VSA display such as unlock or overload states that signal an instrument failure.

If the test can be completed as normal, but the test fails, you should:

• Ensure the equipment connections are torqued to proper specs.

• Check cables and adapters for damage.

• Check the output and input connectors on the test equipment for damage.

• Ensure that there are no error messages on the DUT screen that can signal a problem elsewhere in the instrument.

Determine if an adjustment is causing the analyzer to fail the performance test. Do the adjustments, if any, associated with the failing performance test.

The following table lists the assembly or assemblies most likely to cause the failure. Multiple probable faulty assemblies are listed in order of probability.

If more than one performance test fails, use the entry closest to the beginning of the table. However, note that a failure on any assembly in the input RF path could cause many of the performance tests to fail. See the E4406A Overall Block Diagram in the service guide and for other troubleshooting information.