THEODOLITES SET-UP

THEODOLITES SET-UP

1. Place the instrument over the point with the tripod plate as level as possible and with two tripod legs on the downhill side, if applicable.
2. Stand back a pace or two and see if the  instrument appears to be over the station; if it does not, adjust the location and check again from a pace or two away.
3. Move to a position 90° opposed to the original inspection location and repeat step 2.
4. Check that the station point can now be seen through the optical plummet (or that the laser plummet spot is reasonably close to the setup mark). Then push the tripod legs firmly by pressing down on the tripod shoe spurs.
5. While looking through the optical plumb (or at the laser spot), manipulate the leveling screws (one, two or all the three at a time) until the cross hair (bull’s-eye) of the optical plummet or the laser spot is
directly on the station mark.
6. Level the theodolite circular bubble by adjusting the tripod legs up or down.
7. Perform a check through the optical plummet or note the location of the laser spot to confirm that it is still quite being over the station mark.
8. Turn one (or more) leveling screws to be sure that the circular bubble is now exactly centered (if necessary).
9. Loosen the tripod clamp bolt a bit and slide the instrument on the flat tripod top (if necessary) until the optical plummet or laser spot is exactly centered on the station mark. Retighten the tripod clamp bolt and reset the circular bubble, if necessary.

10. The instrument can now be precisely leveled by centering the tubular bubble.
Set the tubular bubble so that it is aligned in the same direction as two of the foot
screws. Turn these two screws (together or independently) until the bubble is
centered. Then turn the instrument 90°, at which point the tubular bubble will be
aligned with the third leveling screw.
Next, turn that third screw to center the bubble. The instrument now should be
level, although it is always checked by turning the instrument through 180°.
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