Nikon NPL-632 Instruction Manual page 30

2 Preparation
To center the instrument using the optical plummet:
1.
2.
3.
4.
5.
6.
7.
16 Field Station NPL-632 Instruction Manual
Set up the instrument on the tripod. For detailed instructions, see
Tripod, page 15.
While looking through the optical plummet, align
the reticle with the station point. To do this, turn the
leveling screws until the center mark
reticle is directly over the image of the station point.
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.
Tighten the tripod leg clamps.
Use the plate level to level the instrument. For detailed instructions, see
Leveling, page 17.
Look through the optical plummet to check that the image of the station point is
still in the center of the reticle mark.
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.
of the
Setting Up the