Symmetricom 5120A User Manual

5120A/5115A Operations and Maintenance Manual 33
The following phase noise settings can be configured:
 Plot Scale (see page 33)
 Data Markers (see page 35)
 Test Mask (see page 38)
 Display Tools, including Time Constant (see page 41)
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
–4
, 10
–3
, 10
–2
, 10
–1
10
0
, 10
1
, 10
2
, 10
3
, 10
4
, 10
5
,
and 10
6
.
 Fixed linear scale x:
• Forces minimum x value of 0 Hz.
• Allows the following maximum values (Hz): 10
–3
,10
–2
, 10
–1
10
0
, 10
1
, 10
2
, 10
3
, 10
4
,
10
5
, and 10
6
.
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.
To scale the plot using softkeys:
1. Navigate to the Phase Noise Plot. See “3.1.1 Navigation” on page 12 for details.

Symmetricom 5120A Specifications

General

Brand	Symmetricom
Model	5120A
Category	Recording Equipment
Language	English