Teledyne LeCroy SDA II User Manual
Page 25
Operator's Manual
This measurement algorithm is best suited to eye diagrams that are rendered from optical rather than
electrical signals. In the presence of inter-symbol interference and/or equalization, it may not give rea-
sonable results.
The Q factor is a measure of the overall signal-to-noise ratio of the data signal. It is computed by taking
the eye amplitude (the difference between the mean values of the 1 and 0 levels) and dividing it by the
sum of the noise values (standard deviations of the 1 and 0 levels).
All of these measurements are taken in the center (usually 20%) of the eye. Users can show the Q factor
via the Measure system.
Mask Hits
Number of samples where the signal impedes the mask.
Mask Out
Number of samples where the signal does not impeded the mask.
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