Chapter 1 59
Troubleshooting
Troubleshooting Performance Test Failures
NOTE If more than one performance test fails, use the entry closest to the
beginning of the table. However, please 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 Chapter 2
Table 1-4 lists the assembly or assemblies most likely to cause the
failure. Multiple probable faulty assemblies are listed in order of
probability.
Step 3. Go to "Isolating an RF, Analog IF, Digital IF, Reference, Synthesizer, or
CPU Problem" on page 39.
Step 4. The Absolute Amplitude Accuracy test combines the amplitude and
frequency data taken in the Frequency Response (Flatness) test and the
Amplitude Accuracy at 50 MHz test. Look at the data for these two
tests to see what measurements may be causing the failure. Use this
information to help isolated the failure. Go to "Isolating an RF, Analog
IF, Digital IF, Reference, Synthesizer, or CPU Problem" on page 39.
Step 5. Use a spectrum analyzer to trace a signal through the RF input path to
determine where the extra noise is being added. See the E4406A
Overall Block Diagram in Chapter 2. Go to "Isolating an RF, Analog IF,
Digital IF, Reference, Synthesizer, or CPU Problem" on page 39 to help
isolate the problem.
Step 6. Use a spectrum analyzer to trace a signal through the RF input path
using the failing spurious setup. See the E4406A Overall Block
Diagram in Chapter 2. Go to "Isolating an RF, Analog IF, Digital IF,
Reference, Synthesizer, or CPU Problem" on page 39 to help isolate the
problem.
Step 7. Check the condition of the input connector. See the E4406A Overall
Block Diagram in Chapter 2 .
Input VSWR None AT1 Input connector
A17 RF
Step 7
a. Refer to the N7812A software to do this adjustment.
Table 1-4 Performance Test Failures
Failing Performance Test Adjustment Probable Faulty Assembly Next Step
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