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center
buble
Screw C
Screw B
Screw A
4)Using the plate level to level the instrument precisely
① Loosen the horizontal locking screw and turn the
instrument around until the plate level is perpendicular to a line
shaped with screws A and B. Adjust the screws A and B to make
the bubble in the center of the level.
② Turn the instrument approximately 90° and adjust
screw C until the bubble in the center of the level.
③Turn around the instrument 90°again. Repeat above steps
until the bubble remains in the center of the plate level even
though the instrument is rotated to any position.
4.2.2 Using centering device to centre
1) Set up the tripod
① Open the tripod. Make sure that the three feet of the
tripod are approximately equal in distance from the center and
that the top is leveled. Screw up the three locking screw.
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