Scaling The Phase Noise Plot - Symmetricom 5120A Operation And Maintenance Manual

The following phase noise settings can be configured:
Plot Scale (see
Data Markers (see
Test Mask (see
Display Tools, including Time Constant (see

5.1.1 Scaling the Phase Noise Plot

The phase noise plot can be scaled logarithmically or linearly in the following ways:
Automatically scale the y axis:
•
Sets the dB/division to the closest values that allow display of all data.
•
Sets the top grid line to a multiple of the selected dB/division value.
Manually scale the y axis:
•
Allows for shifting the displayed values from a maximum of 60 dBc/Hz to a minimum
of -240 dBc/Hz.
•
Lets you increase or decrease the dB/division allowing the following values: 0.5, 1,
1.5, 2, 5, 10, 15, 20, 25, and 30.
Automatically scale the x axis:
•
Sets the x scale to logarithmic.
•
Sets the minimum and maximum frequency to fit all data.
Fixed logarithmic scale x:
•
Shows from 1 to 9 decades.
•
Allows the following values (Hz): 10
and 10
Fixed linear scale x:
•
Forces minimum x value of 0 Hz.
•
Allows the following maximum values (Hz): 10
5
10 , and 10
To scale the plot using softkeys:
1. Navigate to the Phase Noise Plot. See
5120A/5115A Operations and Maintenance Manual
page 33)
page 35)
page 38)
6
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6
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Note
The 5120A-01 cannot measure phase noise at offset frequencies greater than 100
kHz when either of the signals connected to the front panel signal input ports has
a frequency less than 2 MHz. When signals with lower frequencies are attached,
the plot can still be scaled to include the 1 MHz offset frequency, but no data will
be plotted from 100 kHz to 1 MHz. Both of the internal oscillators produce
frequencies greater than 2 MHz.
page 41)
–4 –3 –2 –1
, 10 , 10 , 10 10
–3 –2 –1
,10 , 10
"3.1.1 Navigation" on page 12 for details.
0 1 2 3 4 5
, 10 , 10 , 10 , 10 , 10
0 1 2 3 4
10 , 10 , 10 , 10 , 10
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