2. PREPARATION FOR MEASUREMENT
2-2
Reference: Leveling and Centering the Instrument
1. Setting up the Tripod
First, extend the extension legs to suitable
lengths and tighten the screws on their
midsections.
2. Attaching the Instrument on the Tripod
Head
Place the instrument carefully on the tripod
head and slide the instrument by loosening the
tripod screw. If the plumb bob is positioned
right over the center of the point, slightly
tighten the tripod screw.
3. Roughly Leveling the Instrument by Using
the Circular Level
Turn the leveling screws A and B to move
the bubble in the circular level. The bubble
is now located on a line perpendicular to a
line running through the centers of the two
leveling screws being adjusted.
Turn the leveling screw C to bring the
bubble to the center of the circular level.
4. Centering by Using the Plate Level
Rotate the instrument horizontally by using
the Horizontal Shuttle and place the plate
level parallel with the line connecting
leveling screws A and B, and then bring the
bubble to the center of the plate level by
turning leveling screws A and B.
Rotate the instrument 90 (100g) around its
vertical axis and turn the remaining
leveling screw or C to center the bubble once
more.
Repeat the procedures and for each 90
(100g) rotation of the instrument and check
whether the bubble is correctly centered for
all four points.
It is possible to control by soft key to
rotate. Select the required angle in 2 pages
of the soft key functions. (Refer to "1.8
Rotation of the Instrument")
5. Centering by Using the Optical Plummet
Telescope
Adjust the eyepiece of the optical plummet
telescope to your eyesight.
Slide the instrument by loosening the tripod
screw, place the point on the center mark, and
then tighten the tripod screw. Sliding the
instrument carefully not to rotate that allows
you to get the least dislocation of the bubble.
6. Completely Leveling the Instrument
Leveling the instrument precisely in the similar
way to 4. Rotate the instrument and check to
see that the bubble is in the center of the plate
level regardless of telescope direction, then
tighten the tripod screw hard.
Leveling
screw B
Leveling screw C
Leveling screw A
Center mark
Point
Leveling screw C
90
Leveling
screw B
Leveling screw A
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