Agilent Technologies 1660A Series User Reference page 338

The Compare Menu
State Compare is a software postprocessing feature that provides the
ability to do a bit by bit comparison between the acquired state data
listing and a reference listing.
The comparison between the acquired state listing data and the data
in the reference listing is done relative to the trigger points. This
means that the two data records are aligned at the trigger points and
then compared bit by bit.
Any bits in the acquired data that do not match the bits in the
compare image are treated as unequal.
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