User guide

Then the oscilloscope should show an output eye like the following:
If you see a display like above everything is ok.
If you see merely one fixed level, either the N4916B or the output of the Serial
BERT is defective.
Check the Output of the N4916B (De-Emphasis Part) Using the Error
Detector
If you have connected the N4916B to a Serial BERT and have no oscilloscope at
hand, you can use the error detector for checking the output of the N4916B.
1
Connect the ED Data-In to the Data Out of N4916B
2
Connect the ED Clock In to the PG Clock Out
3
Terminate PG Data Out with 50Ohm
4
Terminate PG Clock Out with 50Ohm
5
Ensure that the error detector follows the generated pattern.
– Press the Auto Align button.
– From the Analysis panel select the Eye Diagram page.
– Press the Start button.
Solving Problems 9
Agilent J-BERT N4903B High-Performance Serial BERT 505