Chapter 2 65
Overall Troubleshooting
Troubleshooting Performance Test Failures
Troubleshooting Performance Test Failures
This information assumes the analyzer is making measurements but a
performance test is failing by a small margin, or only a few
measurements are failing. If most of the performance tests are failing,
go to "Check the Basics" on page 45.
Step 1. Determine if an adjustment is causing the analyzer to fail the
performance test.
Do the adjustments, if any, associated with the failing performance test.
Step 2. Determine the probable faulty assembly by comparing the performance
test results to Table 2-4.
NOTE Please note that a failure on any assembly in the input RF path could
cause many of the performance tests to fail. See the Overall Block
Diagram in Chapter 9 .
Table 2-4 lists the assembly or assemblies most likely to cause the
failure. Multiple probable faulty assemblies are listed in order of
probability.
Table 2-4 Performance Test Failures
Failing
Performance Test
Adjustment Probable
Faulty Assembly
Troubleshooting
Information
Residual Responses None RF Section - cables and
assemblies
Chapter 3
Chapter 4
Displayed Average
Noise Level (DANL)
2nd LO Power
Lowband Mixer Bias
SLODA/FELOMA
RF Section
A8 Analog IF/
A31 Wide Analog IF
A10 3rd Converter
A19 RYTHM
A20 Lowband
A22 Preamp
Chapter 3
Chapter 4
Chapter 6
Frequency Reference
Accuracy
10 MHz Internal
Frequency Reference
A11 Reference Chapter 5
Frequency Readout
Accuracy
10 MHz Internal
Frequency Reference
A11 Reference Chapter 5
Count Accuracy 10 MHz Internal
Frequency Reference
A11 Reference Chapter 5
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