Teledyne LeCroy SDA II - Manual (Page 21)

Operator's Manual
Mask Testing
Mask testing to either absolute or normalized masks can be performed with SDAIII-CompleteLinQ. You
can determine where the signal has violated the mask, how many failures have occurred, and determine
which particular UI is in violation.
When selecting a Signal Type on the Signal tab for a serial data standard, the Mask section of the Eye
Measure. Each standard has a set of required tests; some of the standards specify using a specific mask
template. Masks templates are stored in the database file EyeMaskProps.mdf, which can be edited via
the Mask Database Editor tool. A shortcut to launch this tool can be found in the LeCroy folder of the
Start menu.
Masks are either "absolute" or "normalized". Absolute masks specify specific voltage and time values.
When using absolute masks, the position of mask features will depend on the volts/div setting of the
mask. Normalized masks reference grid locations rather than absolute voltages.
You can also define how much to enlarge the mask in order to ensure your signal passes the mask plus
some additional margin.
Eye Diagram Configuration Dialog
The Eye Diagram right-hand dialog lets you configure how the eye diagram is displayed.
Show Eye - Displays the eye diagram(s).
Show Mask- Displays the mask template(s). If Custom or Clock is chosen for the Signal Type in the Signal
tab, then this checkbox is greyed out. (Users can create custom masks by defining a new signal type.)
Show IsoBER - Displays IsoBER, which provides a visual representation of the extrapolated eye diagram.
When you enable this, press Start IsoBER Scan.
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