Spectra Precision Focus 8 Series Total Station User Guide 27
Preparation 2
Centering using the laser plummet
WARNING – Do not look into the laser directly.
Note – If you require high accuracy, check and adjust the laser plummet before you center
the instrument. For detailed instructions, see Checking and adjusting the circular level,
page 44.
1. Set up the instrument on the tripod. For detailed instructions, see Setting up the
tripod, page 25.
2. Turn on the laser plummet.
3. Align the laser pointer to the station point. To do this, turn the leveling screws
until the laser pointer is over the station point.
4. While supporting the tripod head with one hand, loosen the tripod leg clamps
and adjust the lengths or the legs until the air bubble is the center of the circular
level.
5. Tighten the tripod leg clamps.
6. Use the electronic level to level the instrument. For detailed instructions, see
Leveling, page 29.
7. Check the laser pointer is over the station point.
8. 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
Centering using a plumb bob
1. Set up the instrument on the tripod. For detailed instructions, see Setting up the
tripod, page 25.
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 tribrach, 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.
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