
5120A/5115A Operations and Maintenance Manual
33
The following phase noise settings can be configured:
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
–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.
on page 12 for details.
Содержание 5115A
Страница 6: ...iv Contents Index 97 ...
Страница 12: ...6 1 Introduction ...
Страница 16: ...10 2 Setting Up a PNTS ...
Страница 26: ...20 3 The Screen and Basic Concepts ...
Страница 82: ...76 9 Maintaining a PNTS ...
Страница 92: ...86 Appendix A Specifications ...
Страница 98: ...92 Appendix B Theory of Operation ...
Страница 100: ...94 ...
Страница 102: ...96 ...
Страница 106: ...100 ...