
②
Turn the leveling screw C to move the bubble to the center of the circular vial.
4) Precisely leveling by using the plate vial
①
Rotate the instrument horizontally by loosening the Horizontal Clamp Screw and place
the plate vial parallel to the line connecting leveling screw A and B , and then bring the
bubble to the center of the plate vial by turning the leveling screws A and B.
②
Rotate the instrument 90º(100g) around its vertical axis and turn the remaining leveling
screw or leveling C to center the bubble once more.
③
Repeat the steps
①②
for each 90º(100g) rotation of the instrument and check whether
s.
three legs, spread and make tripod head
o the point
the bubble is correctly centered in all direction
2
、
Centering by using the optical plummet
1) Set tripod
Lift tripod to suitable height, ensure equal length of
parellel to the ground, and place it right above the measurement station point. Prop up tripod on
the ground and fix one leg.
2) Install instrument and collimate t
10
Содержание STS-750
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