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MS278XB OM 5-27
Measuring Phase Noise
The following example shows a basic measurement of a 1 GHz carrier’s 100 kHz phase noise using markers:
1. Preset the analyzer using the Preset button.
2. On the analyzer, set up the following:
Center Frequency: 1 GHz
Span: 1 MHz
RBW: 1 kHz
Sweep Time: 30 seconds
3. On the System | Configuration menu, set the Optimize Phase Noise to Manual and set >85 kHz.
4. On the Trace Config menu, set the Trace 1 detector to Maximum.
5. Press the Mkr–>Pk icon, and then the Pk–>RL icon.
6. On the Trace Config menu, select Trace 2 as the active trace, Trace Mode to Clear-Write, and then set its
detector to RMS.
7. On the Marker menu, select Marker 2 as the active marker, set its Marker Function as a Delta Marker on
Trace 2, and then set its frequency to 100 kHz.
8. On the Marker Config menu, set Marker 2 as a Noise Marker.
9. Read the delta marker value from the top of the graticule.
The display should look like the one in the figure below:
Figure 5-8. Measuring Phase Noise