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2) Using Optical Plummet
• Carry out the “CHECKING AND ADJUSTMENT of Optical Plummet” (p.41)
when the centering operation is performed at a position higher than the
station point.
• For high accuracy, carry out the “CHECKING AND ADJUSTMENT of
Optical Plummet” (p.41) before the centering operation.
For the models with detachable leveling base
(1) Place the instrument on the tripod head. Insert the instrument clamp
screw into the center hole of the instrument’s base plate and tighten.
(2) Looking through the optical plummet, align the station point image
with the center mark
of the reticle by turning the leveling screws.
(3) While supporting the tripod head with one hand, loosen the tripod leg
clamps and adjust the length of each leg to center the air bubble in the
circular level. Then tighten the tripod leg clamps.
(4) Using the plate level, proceed to the leveling procedures described in
the next section, “Leveling”.
(5) Looking through the optical plummet, check if the station point image
is still centered in the reticle mark
.
(6) If a slight displacement is detected, loosen the instrument clamp screw
and adjust the position by moving the instrument laterally (not
rotationally) on the tripod head. If the displacement is large, repeat
Steps from (2).
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