27
center
buble
Screw C
Screw B
Screw A
4)
Using the plate level to level the instrument precisely
①
Loosen the horizontal locking screw and turn the
instrument around until the plate level is perpendicular
to a line shaped with screws A and B. Adjust the screws
A and B to make the bubble in the center of the level;
Screw C
Screw B
Screw A
②
Turn the instrument approximately 90° and adjust
screw C until the bubble in the center of the level;
Screw C
Screw B
Screw A
③
Turn around the instrument 90°again. Repeat above
steps until the bubble remains in the center of the plate
level even though the instrument is rotated to any
position.
4.2.2 Using centering device to center
1)
Set up the tripod;
①
Open the tripod. Make sure that the three feet of the
tripod are approximately equal in distance from the