User guide

Explanation of the Numerical Results
Additionally to the graphical results, the measurement provides numerical results:
Measurement Parameters
The measurement parameters are defined in the following List:
• Time Eye Opening
This is the maximum extension of the BER threshold contour line in sample
delay direction (eye width).
N O T E
This value is different from the horizontal extension of the BER threshold bounding
box.
• Threshold Eye Opening
This is the maximum extension of the BER threshold contour line in sample
voltage direction (eye height).
N O T E
This value is different from the vertical extension of the BER threshold bounding
box.
• Optimal Sample Delay
This is the sample delay coordinate of the center of a bounding box around the
BER threshold contour line.
• Optimal Sample Threshold
This is the sample voltage coordinate of the center of a bounding box around
the BER threshold contour line.
Unavailable Values
If you make a measurement that results in an incomplete eye (no closed contour
line at the BER threshold), the numerical results cannot be calculated. In this case,
the software will issue a warning message.
If this happens, you should first of all check the settings of the low and high decision
threshold voltages.
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 301