User guide

These settings are used for data collection. Changes require to run the test
again. See “Parameters Tab” on page 252 for details.
– Pass/Fail tab
These settings determine whether the calculated results are recognized as
passed or failed. However, a new test run is not required when doing
changes here. See “Pass/Fail Tab” on page 254 for details.
– View tab, Graph tab, and Color tab
All settings on these tabs only affect the way the data is displayed. You do
not need to run the measurement again. See “View Tab” on page 256,
“Graph Tab” on page 258, and “How to Change the Colors of the Graph”
on page 232 for details.
3
Press OK when you have made all required changes to close the Properties
dialog box.
Spectral Jitter - Reference
The Spectral Jitter measurement returns the results in a graphical and in a
numerical form. The following sections provide explanations of the measured
parameters and the display options that are specific to this measurement.
Additionally, some information is provided to explain the theoretical background
behind the jitter calculations.
Properties that can be specified on the various tabs of the Properties dialog box:
Parameters Tab
N O T E
If you modify the parameters on this page, you have to rerun the measurement to
update the results.
Set the data acquisition parameters:
•
Acquisition Depth
Suitable numbers can be chosen from the drop-down list.
The Acquisition Depth determines the length of the time record used for the
FFT.
A smaller number reduces the duration of the Spectral Jitter measurement and
its precision. A larger number increases the measurement duration but also
the frequency resolution of the measured spectral components.
The frequency resolution of the measurement is:
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 353