Agilent Technologies N9320A Guía de usuario descargar pdf (Pagina 61)

Functions and Measurements 3

N9320A Spectrum Analyzer 53

Measuring Phase Noise

Phase noise is a frequency domain measure of stability. We

specify phase noise as single- sideband power in relation to

the fundamental RF output frequency, and measured at

various offset frequencies from the carrier, normalized to a

one hertz 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 change 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

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 177 178

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Agilent Technologies N9320A Guía de usuario Pagina 61