Measurements

Measurement Examples

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

MS278XB OM

5-27

Page 183
Image 183
Anritsu Series MS278XB operation manual Measuring Phase Noise