Setting The Datum (Absolute Zero) - ACU-RITE 100S Reference Manual

OPERATION

Setting the Datum (Absolute Zero)

allows you to measure both absolute and incremental dimensions.
100S
A dimension measured from the point you define as the datum is an
absolute dimension. A dimension measured from any other point on your
print is an incremental dimension.
Datum, also known as absolute zero or workpiece zero, is the reference
point from which will base all of your part's coordinates. When
100S
the readout is in the ABS mode, it is actually measuring the distance
from the datum to the table's current position.
You will need to establish a datum for every job. Your datum may
already be identified on your print; if it isn't, then establish a datum that
allows you to enter most of your part's dimensions directly, with the
least number of calculations.
All of the dimensions in the drawing below are based from the datum.
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100S