2 Preparation
16 Pulse Laser Station NPL-302 Series Instruction Manual
When the instrument is centered, tighten the mounting screw.
– If the displacement of the station point is major, repeat this procedure from
Step 2.
Centering using a plumb bob 20.1
1. Set up the instrument on the tripod. For detailed instructions, see Setting Up the
Tripod, page 14.
2. Hang the plumb line on the hook of the tripod mounting screw.
3. Adjust the length of the plumb line so that the tip of the plumb bob is at the
height of the station point.
4. Loosen the tripod mounting screw slightly.
5. Using both hands to support the outer side of the leveling base, carefully slide
the instrument about on the tripod head until the tip of the plumb bob is
positioned over the exact center of the station point.
Note – To confirm that the instrument is precisely aligned, check its position
from two directions at right angles to each other.
Leveling 2.1
When you level the instrument, you make the vertical axis of the instrument exactly
vertical. To level the instrument, use the plate level.
To level the instrument:
1. Loosen the upper plate clamp.
2. Rotate the alidade until the plate level is
parallel with any two of the leveling
screws (B and C).
3. Use leveling screws B and C to move the
bubble into the center of the level.
4. Rotate the alidade approximately 90°.
CB
A
1
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