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Troubleshooting
Troubleshooting Option UNR Phase Noise
Troubleshooting Option UNR 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 Table1-25 to troubleshoot phase noise problems. The
troubleshooting procedure consists of assembly substitution.
NOTE In non–Option UNR signal generators, the most likely assemblies and frequency
offset are the same except for <100 Hz. In non–Option UNR signal generators the
most likely assembly for <100 Hz offset is the A7 Reference.
Table 1-25
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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