Nikon HQA46480, Инструкция по эксплуатации

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Total Station DTM-322 Instruction Manual 13
Preparation 2
Centering
When you center the instrument, you align its central axis precisely over the station
point. To center the instrument, you can either use the optical plummet or a plumb
bob.
Centering using the optical plummet
Note – If you require high accuracy, check and adjust the optical plummet before you
center the instrument. For detailed instructions, see
Checking and Adjusting the
Optical Plummet, page 133 .
To center the instrument using the optical plummet:
1. Set up the instrument on the tripod. For detailed instructions, see Setting Up the
Tripod, page 12 .
2. While looking through the optical plummet, align
the reticle with the station point. To do this, turn the
leveling screws until the center mark of the
reticle is directly over the image of the station point.
3. While supporting the tripod head with one hand,
loosen the tripod leg clamps and adjust the lengths
of the legs until the air bubble is in the center of the
circular level.
4. Tighten the tripod leg clamps.
5. Use the plate level to level the instrument. For detailed instructions, see
Leveling, page 14 .
6. Look through the optical plummet to check that the image of the station point is
still in the center of the reticle mark.
7. If the station point is off center, do one of the following:
–
If the station point is slightly off center, loosen the tripod mounting screw
and then center the instrument on the tripod. Use only direct movement to
center the instrument. Do not rotate it.
When the instrument is centered, tighten the mounting screw.
–
If the displacement of the station point is major, repeat this procedure
from Step 2.