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The SECO 2154-02 GPS Optical Plummet sets up over the point using the same procedure as an optical plummet tribrach or a total station instrument. The prismatic vial allows you to do a high setup. The rotating axis allows you to check adjustment of the vial and of the optical plummet.
SETTING UP THE TRIPOD
1. Loosen quick clamps or twist locks on legs
2. With tripod closed, raise the tripod head to about chin level.
3. Tighten leg locks.
4. Spread the tripod legs so that the three shoes form an equilateral triangle and are fixed firmly in the ground, and the tripod head is approximately level and positioned directly over the surveying point.
CENTERING THE GPS OPTICAL PLUMMET BY ADJUSTING THE LEG LENGTH
1. Mount the 2154-02 on the tripod head. Tighten the tripod's centering screw.
2. Turn the optical plummet eyepiece to focus on the reticle.
Then push or pull the eyepiece to focus on the surveying point.
3. Turn the footscrews to center the surveying point in the reticle.
4. Now look at the circular vial. Observe the off-center direction of the bubble. Shorten a leg nearest to the direction, or extend a leg farthest from the direction. Generally, two legs have to be adjusted to center the bubble.
5. Final leveling can be completed by adjusting legs and/or turning the leveling screws to complete centering of vial.
6. Look thru the optical plummet again. If the surveying point is off-center, loosen the (tripod) centering screw and move the 2154-02 to center the surveying point on the reticle. Then tighten the center screw. Recheck leveling of the vial.
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