User guide

N O T E
Most oscilloscopes measure eyes differently, using statistical data. Therefore, the
eye results of a Serial BERT and an oscilloscope may be different.
The table in the top half of the Eye Results window additionally lists the following
values:
• Eye Voltage Center
One of two components of the sampling point, the 0/1 decision threshold (eye
voltage center) is displayed here.
• Eye Data Input Delay
One of two components of the sampling point, the data input delay is displayed
here.
• Alignment Threshold
The alignment BER threshold is displayed here. This threshold was used to
define the eye edges and the above eye results.
• Delta Error Ratio
The BER measured during the previous 200 ms is displayed here.
7 Evaluating Results
394 Agilent J-BERT N4903B High-Performance Serial BERT