60
7: Collecting and Viewing Data Remotely
Use the
show spectrum
command to retrieve the (f) phase noise data collected thus far. The
command returns the current time constant followed by a header labeling the first column as the
offset frequency coordinate and second as its power spectral density. It then returns the same
measurements that are plotted, one per line, with frequency in Hz followed by the power spectral
density in dBc/Hz. The 5120A and 5120A-01 then output the noise floor.
Use the
show spurs
command to retrieve the spur table. The command returns a header labeling
the following columns, then the spurs, one per line. Each line includes the spur’s index and its
frequency and power.
Use the
show ipn
command to retrieve the current time constant and integrated phase noise table.
Use the
show adev
command to retrieve the Allan deviation. The test set outputs the current time
constant followed by an Allan deviation table for each
τ
0
for which it is computed. Each table is
prefixed with the
τ
0
value and the input filter’s noise equivalent bandwidth. On the 5120A and
5120A-01, the corresponding noise floor is returned after each table. When all tables have been
returned, the command prompt is displayed again.
Use the
show phasediff
command to retrieve the one second phase difference strip chart data. The
test set outputs a header. The header indicates if the phase difference data set is paused. If the
linear trend is removed, the header states so and includes the trend’s slope and y-intercept. All
phase difference measurements are output with their corresponding x-coordinate so the
measurement can be related to the linear trend’s y-intercept. For more information about linear
trend removal see
“Chapter 5, Removing the Linear Trend”
Use the
show freqdiff
command to retrieve the one second frequency difference strip chart data.
The test set outputs a header showing that frequency difference data follows. If the frequency
difference data set is paused, the header will indicate this.
Use the
show fcounter
command to retrieve frequency counter data. The command outputs a
header showing the Reference frequency (and how it was set), followed by labels for the averaging
interval and average frequency columns. One line per averaging interval available at this time is
returned.
7.2.4 Printing from the Command Port
All data collected by the PNTS can be printed from the command port.
The
command can be used as a standalone command. When used without a parameter the
screen currently displayed by the graphical user interface is printed. The command is more useful
when used with parameters that specify what to print.
To retrieve a list of the data sets and screens that can be printed, issue the
show
screens
command.
The test set returns a list of print command parameters, one per line each followed by a short
description of what will be printed. The following is a summary of these parameters:
spectplot
- Phase Noise Plot
ipn
- Integrated Phase Noise Table
spurtable
- Spur Table
adevplot
- Allan Deviation Plot (please see note at the end of this section)
adevtable
- Allan Deviation Table (please see note at the end of this section)
phasediff
- Phase Difference Plot
freqdiff
- Frequency Difference Plot
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 ...
