Product Manual

4.3 Centering

4.3.1 Centering with the optical plummet

4.3.1.1 Three-jaw tribrach

Rotate the focusing knob of the optical plummet and

adjust the focus to the ground mark point. Then loosen

the center screw of the tripod. Look through the

optical plummet, and move the base plate on the tripod

head until the center mark coincides with the ground

mark point. Tighten the center screw. Ensuring that the

bubble stays positioned in the center when rotating the

Plate level in steps of 90°(100g). If the bubble is not

positioned in the center, adjust the level screws.

Repeat above steps. Ensure that the center of reticle

plate coincides with the mark point when rotating

alidade of instrument.

Fig. 13

Cross mark

Plummet

center