Troubleshooting
Troubleshooting Option UNJ Phase Noise
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Troubleshooting Option UNJ Phase Noise
Poor grounds 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 nose measurement make sure all 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 making sure the measurement accurately
reflects a failure, use Table1-43 to troubleshoot phase noise problems. The troubleshooting procedure consists
of assembly substitution.
NOTE In non-Option UNJ signal generators, the most likely assemblies and frequency offset are the
same except for <100 Hz. In non-Option UNJ signal generators the most likely assembly for
<100 Hz offset is the A7 Reference.
Table 1-43
Frequency Offset Most Likely Assembly
0 to 100 Hz A32 High Stability Time Base
100 Hz to 10 kHz A7 Reference
10 kHz to 100 kHz A5 Sampler
>100 kHz to 1 MHz A28 YIG Oscillator or A9 YIG Driver
Frequencies <3.2 GHz A8 Output
Frequencies >3.2 GHz A29 20 GHz Doubler or
A30 Modulation Filter
Frequencies >20 GHz A27 40 GHz Doubler
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