ATP-3-09-02 Field Artillery Survey Download
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Chapter 5 5-4 ATP 3-09.02 16 February 2016 Figure 5-3. NE-102 Display operations key SETUP PROCEDURES 5-3. The first step is to emplace the tripod over the station point. Open the legs of the tripod sufficiently enough for the instrument to be stable and ensure the station point is located directly beneath the center hole in the tripod head. A good way to ensure the tripod is at the correct height is to extend the legs to chest height. Press the tripods feet or ferrules firmly into the ground leveling the top of the tripod head then firmly fasten the clamp screws on the tripods legs. 5-4. Once the tripod is securely emplaced, use the carrying handle to remove the NE102 from its case and emplace the instrument to the tripod using the instrument clamp screw on the tripod. Insert the instrument clamp screw into the center hole of the instrument’s base plate and tighten firmly. 5-5. There are two ways to align the instrument precisely over the station mark. One is to use a plumb bob and the other is performed using the optical plumb. 5-6. To center and precisely align the instrument’s central axis over the station point hang a plumb bob on the hook of the instrument’s clamp screw. Adjust the length of the plumb bob line so that the tip of the plumb bob is approximately level with the station point. Slightly loosen the clamp screw and while supporting the outer side of the leveling base with both hands carefully slide the instrument on the tripods head until the tip of the plumb bob coincides with the center of the station point. 5-7. To use the instrument’s optical plumb place the instrument on the tripod head and insert the instrument clamp screw into the center hole of the instruments base plate and tighten securely. Looking through the optical plummet, align the station point image with the center mark of the reticle by turning the leveling screws. While supporting the tripod head with one hand, loosen the tripod legs and adjust the length of each leg to center the air bubble in the circular level. Once the bubble is centered tighten the tripod leg clamps. Then use the plate level to level the instrument. Look through the optical plummet and ensure the station mark is still centered in the reticle mark. If a slight displacement is detected, loosen the clamp screw and adjust the position by moving the instrument laterally (not rotationally) on the tripod head, Confirm precise alignment by viewing from two directions at right angles to each other.