User guide

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Eye Diagram
Eye Diagram - Concepts
The Serial BERT provides quick design analysis with the Eye Diagram capability.
The Eye Diagram allows a quick check for the DUT’s signal output, and determines
the signal quality. Due to the higher sampling depth of a BERT value, the eye
contour lines display the measured eye at a deeper BER level, for accurate results.
The Eye Diagram feature provides the following measurement capabilities:
• Eye Diagram Waveform
• BER Contour Lines
• Automatic Measurement for the most relevant eye parameters:-
– Eye Height
– Eye Width
– Jitter P-P
– Jitter RMS
– Cross Voltage
• Markers
• Eye Mask
The Eye Diagram generates a three dimensional graph of the bit error rate (BER).
This measurement helps in determining and analyzing the quality of the DUT’s
signal output. The Eye Diagram results comprise of voltage(y), time(x), and BER(z).
The Eye Diagram, and the table of Automated Eye Parameter Measurement form
simultaneously. They become more precise with the increasing number of
measured bits.
The following graph shows how the Eye Diagram has been integrated on the J-
BERT N4903A High-Performance Serial BERT.
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 315
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