Agilent Technologies J-BERT N4903B, Руководство пользователя, Страница: 464 / 572

Consider these recommendations when setting up the pattern generator (see
“Setting up the Pattern Generator - Concepts ” on page 121 ).
•
Additional Jitter
components you have to add for the compliance test if the
standard requires non-sinusoidal jitter components, such as random jitter (RJ)
or intersymbol interference (ISI).
N O T E
The recommended ISI setting is only valid, if both pattern and bit rate are set
according to the standard's recommendation (see the corresponding description
items).
Consider these recommendations when composing the desired total jitter (see
“Jitter Setup - Procedures” on page 407 ). 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.
8
Jitter Tolerance Tests
464 Agilent J-BERT N4903B High-Performance Serial BERT
Auto mode