Functions and Measurements
Measuring Phase Noise
56
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
Search
Marker
Marker
Marker D
Noise -97.91 dBc/Hz
20.000 kHz
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