232 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
16 Mask Testing
Mask Region Limit Per Pixel Column
In a mask:
• A maximum of eight regions can be defined.
• However, any given pixel column can intersect a maximum of four different
regions.
• If there are four regions in a pixel column, one of the regions must include the
top pixel (the MAX y value) and another region must include the bottom pixel
(the MIN y value).
Here is an example of a valid eight-region mask:
Note that there is no pixel column that intersects more than four of the regions.
Any column that has four regions includes the regions that are tied to the top and
bottom, respectively.
How is mask testing done?
InfiniiVision oscilloscopes start mask testing by creating a database that is 200 x
640 for the waveform viewing area. Each location in the array is designated as
either a violation or a pass area. Each time a data point from a waveform occurs in
a violation area a failure is logged. If Test All was selected, every active analog
channel is tested against the mask database for each acquisition. Over 2 billion
failures can be logged per-channel. The number of acquisitions tested is also
logged and displayed as "# of Tests".
This pixel column intersects four regions
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