33
11. CHECKS AND ADJUSTMENTS
X
PROCEDURE Checking
1. Carefully level the DT and center a
survey point precisely in the reticle of
the optical plummet.
2. Turn the upper part through 180
°
and
check the position of the survey point
in the reticle.
If the survey point is still centered, no
adjustment is necessary.
If the survey point is no longer
centered in the optical plummet,
perform the following adjustment.
X
PROCEDURE Adjustment
3. Correct half the deviation with the
leveling foot screw.
4. Remove the optical plummet reticle
cover.
5. Use the 4 adjusting screws of the
optical plummet to adjust the
remaining half of the deviation as
shown below.
When the survey point is on the upper
or lower part of the illustration:
Loosen the upper (lower) adjusting
screw slightly, and tighten the lower
(upper) adjusting screw the same
amount to move the survey point to a
point directly under the center of the
optical plummet.
(It will move to the line in the figure on
the right.)
11.4
Optical Plummet
1 (2)
2 (1)
