User guide

2
If desired, change the default values. For example, if only a certain frequency
range has to be tested:
Enter the Start Frequency and the Stop Frequency.
3
Set the Number of Steps between start and stop.
T I P
When Auto Frequencies is activated, the Number of Steps can also be set on the
Standard tab.
The resulting frequency list 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.
In Manual mode, the automatically calculated jitter frequencies can be edited. You
can also enter your own comma-separated list of frequencies.
N O T E
If the frequency list is edited in Manual mode, the Auto Frequencies checkbox on
the Standard tab is automatically deselected.
The Sequence Advance checkbox advances the PG sequence during jitter
tolerance compliance. It will be enabled only if the sequence is send to the PG.
Setting the BER Limit
1
Set the Target Bit Error Ratio.
This defines whether a measured point is flagged green (test passed) or red
(test failed).
Jitter Tolerance Tests 8
Agilent J-BERT N4903B High-Performance Serial BERT 457