Spectra Precision FOCUS 2 Series, User Manual

Page: 27 / 159

SPECTRA PRECISION FOCUS 2 SERIES TOTAL STATION USER GUIDE
2 – Preparation
27
5. Securely fasten the thumb screws on the tripod legs.
6. Place the instrument on the tripod head.
7. Insert the tripod mounting screw into the center hole of the base plate of the instrument.
8. Tighten the tripod mounting screw.
Note – Do not carry the instrument while it is attached to a tripod.
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 (see page 27) or a plumb bob (see page 28).
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 134.
To center the instrument using the optical plummet:
1. Set up the instrument on the tripod. See Setting up the tripod, page 26.
2. While looking through the optical plummet, align the center mark of 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 circular vial to roughly level the instrument. See page 29.
a. Adjust the length of three legs of tripod to make the circular vial bubble of the instrument
centered.
6. Use the plate level vial to level the instrument accurately.
a. Rotate the instrument horizontally by loosening the Horizontal Clamp and place the plate
vial parallel to the line connecting leveling screw A and B, and then bring the bubble to the
center of the plate vial by turning the leveling screws A and B.
b. Rotate the instrument 90°, making it perpendicular to the connecting line of level screws A
and B. Turn level screw C to make the bubble of the plate vial centered.
7. Precisely center and level the instrument.