Agilent Technologies J-BERT N4903, User Manual

Page: 369 / 434

T I P
You can change single frequency points. Press Apply to accept the selected Auto
Frequencies setting and switch to the Frequency tab. In Manual mode, you can
edit the automatically calculated frequencies. If you do so, the Auto Frequencies
checkbox is automatically deselected.
Enter the number of test frequencies ( Number of Steps ) either on this tab,
or on the Frequency tab.
This is the creator's description of the selected standard. Standards
provided by Agilent are described by the following items:
T I P
Use the scroll bar if not all information is displayed.
•
Document that describes the standard in detail. The document name
usually indicates the date or revision of the standard.
•
Recommended settings for the test pattern like Bit Rate range,
Pattern types and voltage level ranges:
– Voltage
Level from Standard : This is the peak-to-peak differential
input level range for the DUT as given in the standard.
– Voltage Level at PG (recom) : This is the recommended output level
at the pattern generator to achieve the minimum voltage Level
from Standard .
N O T E
This recommendation depends on the simulated intersymbol interference (ISI): The
minimum voltage Level from Standard is only met if the trace to simulate the ISI is
selected as in the description item Additional Jitter. Other settings of the ISI can
change the DUT's input level up to four times.
Consider these recommendations when setting up the pattern
generator (see
“Setting up the Pattern Generator - Concepts ” on page
69 ).
•
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).
Jitter Tolerance Tests
7
Agilent J-BERT N4903 High-Performance Serial BERT 369
Description