Northwest NCL-22 User Manual
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85. Checking and Adjusting Your Instrument5.1 Circular LevelSet up your instrument properly on the tripod. Adjust the leveling screws to center the bubble into the circle vial.Turn the telescope 180 degree clockwise, check the bubble position, and then, turn the telescope 180 degreecounterclockwise and check the bubble position again. If the bubble is off center, the circular level needs to beadjusted.5.2 Line of Sight1) Place two rods facing each other at points A and B at a distance of 50 - 80 m apart. Set up your instrument atpoint C, which is about halfway between A and B.2) Sight the rods and take readings on point A as A and from point B as B.3) Set the instrument at point D, which is about 2 m from point A.4) Sight the rods at point A, take reading as AA. And then, sight the rod at point B, take reading again as BB.5) Use the following equation to calculate:BB' = AA - (A - B)The instrument is in its perfect condition if BB' = BB, otherwise, it needs adjustment. |
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