Sokkia CX Series Operator's Manual page 43

2. Loosen the horizontal clamp to
turn the upper part of the
instrument until the plate level is
parallel to a line between levelling
foot screws A and B.
Center the air bubble using
levelling foot screws A and B
simultaneously.
The bubble moves towards a
clockwise rotated levelling foot
screw.
3. Turn the upper part of the
instrument though 90°.
The plate level is now
perpendicular to a line between
levelling foot screws A and B.
Center the air bubble using
levelling foot screw C.
4. Turn the upper part of the
instrument a further 90° and check
to see if the bubble is still in the
center of the plate level. If the
bubble is off-center, perform the
following:
a.Turn levelling foot screws A and
B equally in opposite directions
to remove half of the bubble
displacement.
b.Turn the upper part a further 90°,
and use levelling foot screw C to
remove half of the displacement
in this direction.
Or adjust the plate level.
"35.1 Plate Level"
5. Turn the instrument and check to
see if the air bubble is in the center
position in all directions.
If it is not, repeat the levelling
procedure.
7. SETTING UP THE INSTRUMENT
33