TB 9-4931-541-50
TEST INSTRUMENT
LENGTH GAGE
VERTICAL STAGE
SPINDLE
CONTACT SURFACE
X-Y PLANE
REFLECTIONS FROM
GLASS SURFACE
TEST INSTRUMENT
SPINDLE
Z-Y PLANE
indicator. Repeat for Z-AXIS GIMBLE VERNIER (fig 2). Repeat as necessary for best
possible setting.
NOTE
When making this adjustment, it is important that minimal
downward force is applied with the hand to the vernier.
Downward force may cause problems during this adjustment.
To avoid this problem, place elbow on the solid table surface
near the TI. Using a delicate touch with thumb and forefinger,
grasp and rotate the vernier a small amount at a time.
8. Accuracy
a. Performance Check
(1) Press the 0 and ENT keys on the length gauge indicator and the TI indicator to
zero the indicators.
CAUTION
Any movement or vibration of the TI stand, transducer, length
gauge or gimbaled fixture may cause erroneous readings.
