SHIMPO 921A - Manual (Page 51)

D.4
TRICOR Systems Inc.
Step 6 With the Displacement Verification Mode message displayed on
the unit, turn on and zero the fixture gauge. Be sure the fixture
gauge reads zero, or re-zero the gauge as necessary until the
gauge reads zero before proceeding. Press, then release, then
press and hold in the TEST/READY switch. This is the
approximate zero reading. If the unit display still reads zero,
then re-zero the fixture gauge (if necessary). If the unit reads
other than zero, any difference should be noted and subsequent
fixture gauge readings corrected for the initial zero difference.
Release the TEST/READY switch, monitor the unit displacement
until the next approximate displacement point, then press and
hold the TEST/READY switch. Compare the fixture gauge to the
unit displayed value. The unit value must be within ±0.0003
inch of the corrected gauge value for each displacement check
for acceptance. Repeat until all displacement points listed in
Table D-1, prior to the last displacement point, have been
checked. The unit will automatically stop at the last
displacement point (Do not press TEST/READY switch for this
point). Check the unit displacement to the gauge at this point as
well.
Step 7 Press TEST/READY switch again. The drive mechanism will
retract and go to the home position. This completes the
displacement verification.
Step 8 Power down unit. Remove fixture from baseplate. Remove and
store gauge in original shipping case for protection.