Agilent Technologies 71501D, User Manual

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3-3
Eye-Diagram Analyzer Reference
Performing Eye-Diagram Measurements
Performing Eye-Diagram Measurements
To perform the automatic eye-diagram measurements, use the Measure menu.
With the exception of extinction ratio, these measurements must be per-
formed in eye mode.
Automatic Measurements
The Measure menu’s top two softkeys automatically start measurements:
• EXTINCT RATIO
• MEASURE EYE
• Use the EXTINCT RATIO softkey to automatically compute the extinction ratio
in eye or eyeline modes. This measurement is a ratio of the most prevalent log-
ical one level divided by the logical zero level over one bit interval. When mak-
ing extinction ratio measurements in eyeline mode, the number of samples
should be increased from the default of 1000 to approximately 20000. This in-
sures that a number of traces are evaluated to compute the extinction ratio.