Measuring Phase Noise - Keysight N9320B User Manual

Functions and Measurements

Measuring Phase Noise

Measuring Phase Noise

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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.
> Preset (With Preset Type of Factory)
1
Preset/
Press
System
Connect a cable from the front panel CAL OUT to RF IN.
2
> Alignment > CAL OUT On
Preset/
Press
System
Auto
3
Press to auto- tune the signal to the center of display.
Tune
4
Peak
Press to place a marker on the peak of the signal.
Search
5
Turn on the phase noise function to view the results:
> Function > Phase Noise > Phase Noise (On)
Press
Marker
6
Change the offset:
> Function > Phase Noise > Offset Manual
Press
Marker
Then select the offset by pressing the corresponding softkeys
under the Phase Noise menu.
Marker D
20.000 kHz
Noise -97.91 dBc/Hz