Teledyne LeCroy SDA III-CompleteLinQ - Manual (Page 32)

SDAIII-CompleteLinQ Software
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.
Mask Margin
The Mask Margin setting lets you increase or decrease the size of an Eye mask.
1. Touch inside the X field and enter a value from 0 to 100%. As you enlarge the mask's X margin, you
lengthen the horizontal dimension, bringing the mask closer to your waveform. Consequently, you
will have more failures.
2. Touch inside the Y field and enter a value from 0 to 100%. As you enlarge the mask's Y margin, you
widen the vertical dimension, bringing the mask closer to your waveform. Consequently, you will
have more failures.
3. Touch the Vertical Auto fit checkbox if you want to scale the eye pattern.
Note: The vertical autofit function sets the scaling of the eye pattern so that the one level is at the second
vertical division above center, and the zero level is at the second division below center. The Vertical Auto
fit checkbox is automatically checked or unchecked depending on the Signal Type that you selected. For
example, when an absolute mask like XAUI is selected, the Vertical Auto fit box is unchecked; but, it is
checked for a normalized mask like FC1063.
Scaling for absolute mask signals is accomplished by setting the vertical scale of the input signal.
30 921143 Rev A