HP 54750A, User Manual, Page: 109 / 478

T esting to a Mask
Mask testing is a test process used to verify that waveforms generated
by a test device conform to a predened standard. Typically a mask is a
constellation of polygons with shapes used to dene relative regions where
the waveform may not exist. F or NRZ digital data, mask testing is used with
eye diagrams to dene the required opening or center of the eye , as well as
the unacceptable region above the logic 1 level and below the logic 0 level.
Both the HP 54750A and HP 83480A can test waveforms against user-dened
custom masks created and stored using a built-in mask editor (refer to the
Mask Menu section, located in Chapter 6). In addition, a variety of industry
standard masks are integrated into the HP 83480A for both optical and
electrical waveform test.
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