Testing 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. For NRZ digital data, mask testing is used with
eye diagrams to dene the required opening or center of the eye,aswellas
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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