Sokkia DT20C, Руководство оператора

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13
5. SETTING UP THE INSTRUMENT
4. Turn the upper part of the instrument
though 90
°
.
The plate level is now perpendicular to
a line between leveling foot screws A
and B.
Center the air bubble using leveling
foot screw C.
5. 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 leveling 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 leveling foot screw C to
remove half of the displacement in
this direction.
Or adjust the plate level.
C
"11.1 Plate Level"
6. 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 leveling
procedure.
7. Loosen the centering screw slightly.
Looking through the optical plummet
eyepiece, slide the instrument over the
tripod head until the survey point is
exactly centered in the reticle.
Retighten the centering screw
securely.
8. Check again to make sure the bubble
in the plate level is centered.
If not, repeat the procedure starting
from step 3.