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4) Precisely leveling by using the plate vial.
a. 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.
b. Rotate the instrument 90º (100gon) around its vertical axis and turn the remaining leveling screw
or leveling C to center the bubble once more.
c. Repeat the steps a and b for each 90º (100gon) rotation of the instrument and check whether the
bubble is correctly centered in all directions.
2. Centering by using the optical plummet.
1) Set tripod
Lift tripod to suitable height, ensure equal length of three legs, spread and make tripod head parallel
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 the point
Set instrument carefully on tripod, tighten the central connecting screw and adjust optical plummet
to make the reticle distinctly. Hold the other two unfixed legs with both hands and adjust position of
these two legs through observation of optical plummet. As it approximately aims at the station point,
make all three legs fixed on the ground. Adjust three leg screws of the instrument to make optical
plummet collimate precisely to the station point.
3) Use circular vial to roughly level the instrument.
Adjust length of three legs of tripod; make the circular vial bubble of the instrument in the middle.
4) Use plate vial to level the instrument accurately.
a. 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.
b. Rotate the instrument 90° , make it perpendicular to the connecting line of level screws A and B.
Turn level screw C to make the bubble of the plate vial in the middle.
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