Agilent Technologies J-BERT N4903, User Manual

Page: 370 / 434

Consider these recommendations when composing the desired total
jitter (see
“Jitter Setup - Procedures” on page 326 ). Note that the
sinusoidal jitter is automatically generated and no setup is required.
Frequency Specification
You can choose Auto or Manual mode.
In Auto mode, the jitter frequency is automatically swept from Start
Frequency to Stop Frequency .
•
Start Frequency : This is the minimum and first jitter frequency to be
generated. It determines the left-hand border of the graphical result
display.
•
Stop Frequency : This is the maximum and last jitter frequency to be
generated. It determines the right-hand border of the graphical
result display.
The measurement always includes the start and stop frequencies.
The frequency scale is logarithmic.
• Number of Steps : The Number of Steps between start and stop defines
the test frequencies.
The location of the individual test frequencies depends on the setting
of the
Auto Frequencies checkbox on the Standard tab:
– Checkbox is selected (default):
The list yields frequencies that are recommended for the selected
standard, for example, the edge frequencies.
– Checkbox is not selected:
The list of frequencies yields a set of logarithmically equidistant
frequencies.
N O T E
Alternatively, you can set the Number of Steps on the Standard tab.
In Manual mode, you can edit the automatically calculated frequencies.
You can also enter a single frequency or your own list of frequencies.
For example, you can jump between low and high jitter frequencies.
Enter the frequencies in Hz, separated by commas, for example:
2e4, 1.75e6, 6.334e5, ...
7
Jitter Tolerance Tests
370 Agilent J-BERT N4903 High-Performance Serial BERT
Auto mode
Manual mode