16 Analyzing Data
352 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Up to 8 regions can be defined for a mask. They can be numbered 1- 8.
They can appear in any order in the .msk file. The numbering of the
regions must go from top to bottom, left to right.
An Automask file contains two special regions: the region “glued” to the
top of the display, and the region that is “glued” to the bottom. The top
region is indicated by y-values of “MAX” for the first and last points. The
bottom region is indicated by y- values of “MIN” for the first and last
points.
The top region must be the lowest numbered region in the file. The
bottom region must be the highest numbered region in the file.
Region number 1 is the top mask region. The vertices in Region 1 describe
points along a line; that line is the bottom edge of the top portion of the
mask.
Similarly, the vertices in Region 2 describe the line that forms the top of
the bottom part of the mask.
The vertices in a mask file are normalized. There are four parameters that
define how values are normalized:
• X1
• X
• Y1
• Y2
These four parameters are defined in the Oscilloscope Setup portion of the
mask file.
The Y- values (normally voltage) are normalized in the file using the
following equation:
Y
norm
= (Y - Y1)/Y
where Y = Y2 - Y1
To convert the normalized Y- values in the mask file to voltage:
Y = (Y
norm
* Y) + Y1
where Y = Y2 - Y1
The X-values (normally time) are normalized in the file using the
following equation:
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