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6
Advanced Analysis
N O T E
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This is achieved by measuring the bit error rate at a limited number of test points.
Up to 32 measurement points can be specified, each defined by a sampling time
relative to the actual sampling point (which can be the optimum sampling point)
and a threshold voltage (which is adaptive). In practice, six measurement points
will often suffice to approximate the shape of the eye. Six measurement points are
preset by default.
The Fast Eye Mask can be run by using the appropriate SCPI commands, making it
possible to integrate the Serial BERT into a testing environment. See the
Programming Guide for details.
Example Results
The Fast Eye Mask measurement measures the bit error rate at certain
measurement points. These points have to be positioned inside the expected eye
opening.
The results of a Fast Eye Mask measurement are displayed in numerical form:
The rows Relative Time and Voltage define the positions of the measurement
points. The last row shows the measured bit error rates at these points.
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The Relative Time of the measured points refers to the actual sampling point.
If synchronization and auto-alignment were successful, the current sampling
point is the optimum sampling point.
Agilent J-BERT N4903B High-Performance Serial BERT
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