Installation guide

Troubleshooting
Troubleshooting Phase Noise (Option UNJ and Option 506 Only)
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Troubleshooting Phase Noise (Option UNJ and Option 506 Only)
Poor grounding or shielding problems in either the test environment or the measurement system can cause
the phase noise measurement to fail. Physical vibration is another common cause of phase noise. Before
performing a phase noise measurement, assure that all instrument covers are installed, the work surface is
free of physical vibrations, and the phase noise system is working properly.
Phase noise failures at specific offsets are fairly predictable. After assuring that the phase noise
measurement accurately reflects a failure, use Table 1-42 to troubleshoot phase noise problems. The
troubleshooting procedure consists of assembly substitution.
Table 1-42
Frequency Offset... Most Likely Assembly Causing Phase Noise Failure...
0 to 10 kHz A18 Reference (Option UNJ or Option 506)
>10 kHz to 100 kHz A15 Sampler (Option UNJ or Option 506)
>100 kHz to 1 MHz A21 YTO Driver (Option UNJ or Option 506)
Frequencies ≤ 4 GHz A13 Output
Frequencies > 4 GHz A14 Extended Frequency Output (Option 506)