Nikon DTM-502 Series Instruction Manual page 162

4. CHECKING AND ADJUSTMENT
4-1. Plate Level
(Making the axis of the level vial at right angle to the vertical axis of the
instrument)
1) Checking
(1) Set up the instrument on the tripod and follow the leveling procedures
described in [2-5. Leveling] p.2-10.
(2) Rotate the alidade 180°.
(3) Check to see if the bubble remains in the center of the vial. If a displacement
is detected it should be adjusted. Refer to the following adjustment
procedure.
2) Adjustment
(1) Using the adjusting pin supplied, rotate
the plate level's adjustment screw to
move the bubble to eliminate half of
the displacement detected.
(2) Take up the remaining displacement
with leveling screw A (refer to the
Figure in p.2-10), centering the bubble.
(3) Recheck, and repeat if necessary.
4-2. Circular Level
1) Checking
After confirming the plate level is in
adjustment, check for any displacement of
the bubble's centering in the circular level.
If it is out of adjustment, use the adjusting
pin to manipulate the three adjustment
screws, centering the bubble.
4
4-1