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36. STANDARD EQUIPMENT AND OPTIONAL ACCESSORIES
2. Level the instrument and check
the position of the bubble of the
plate level.
3. Turn the upper part through 180°
and check the bubble position.
If the bubble is still centered, no
adjustment is necessary.
If the bubble is off-center, adjust as
follows.
4. Correct half of the bubble
displacement using levelling foot
screw C.
5. Correct the remaining half of the
displacement by using the
adjustment pin to rotate the plate
level adjustment screw.
When the plate level adjustment
screw is turned in the
counterclockwise direction, the
bubble moves in the same
direction.
6. Rotate the top of the instrument
and continue adjustments until the
bubble remains centered for any
position of the upper part.
If the bubble does not move to the
center even when the adjustment
has been repeated, ask your local
dealer to adjust it.
• Adjust the optical plummet of the
AP41 instrument height adaptor
following the checking and
adjustment methods of optical
plummet.
"35.5 Optical Plummet"
291
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