Agilent Technologies N9320A Guide de l'utilisateur télécharger pdf (Page 62)

54 N9320A Spectrum Analyzer

3 Functions and Measurements

Measuring Phase Noise

Phase noise is a frequency domain measure of stability.

Phase noise is specified as single- sideband power in relation

to the fundamental RF output frequency. It is measured at

various offset frequencies from the carrier, normalized to a 1

Hz measuring bandwidth.

In this example the 50 MHz amplitude reference signal is

used as the fundamental signal.

1 Press > Preset (With Preset Type of Factory)

2 Connect a cable from the front panel CAL OUT to RF IN.

Press > Alignment > CAL OUT On

3 Press to auto- tune the signal to the center of display.

4 Press to place a marker on the peak of the signal.

5 Turn on the phase noise function to view the results:

Press

> Function > Phase Noise > Phase Noise (On)

6 Change the offset:

Press

> Function > Phase Noise > Offset Manual

Then select the offset by pressing the corresponding softkeys

under the Phase Noise menu.

Preset/

System

Preset/

System

Auto

Tune

Peak

Marker

Marker D

Noise -97.91 dBc/Hz

20.000 kHz

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Agilent Technologies N9320A Guide de l'utilisateur Page 62