Troubleshooting Option Unj Phase Noise - Agilent Technologies PSG Series Service Manual

Troubleshooting

Troubleshooting Option UNJ Phase Noise

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
of assembly substitution.
Table 1-43
Frequency Offset
0 to 100 Hz
100 Hz to 10 kHz
10 kHz to 100 kHz
>100 kHz to 1 MHz
Frequencies <3.2 GHz
Frequencies >3.2 GHz
Frequencies >20 GHz
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.
1-66
to troubleshoot phase noise problems. The troubleshooting procedure consists
Most Likely Assembly
A32 High Stability Time Base
A7 Reference
A5 Sampler
A28 YIG Oscillator or A9 YIG Driver
A8 Output
A29 20 GHz Doubler or
A30 Modulation Filter
A27 40 GHz Doubler