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15
DISTANCE MEASUREMENT
Distance measurement with stadia hair of the telescope
The distance from the measuring object to the instrument can be obtained by using
the stadia hair (up and down or left and right) of the telescope, with the accuracy of
≤0.4%L(L: the distance of the target).
Measurement methods:
1. Set up the instrument at point A and put the surveying rod on point B.
2. Read the intercept of apparent lines from up and down(or left and right) from the
reticule on the survey rod.
3. The horizontal distance (L) between A and B equals L=a×l00.
INSPECTION AND ADJUSTMENT
Let the plate vial be in parallel with a line joining any two of leveling screws. Adjust the
two leveling screws and position the bubble in the center of the vial by turning the screws
in opposite directions at the same time.
Rotate the instrument 180°. If the bubble is in the center and always in the center while
the plate vial is moved to any directions, the plate vial is set correctly and the instrument
is leveled.
Adjustment
Leveling with plate vial, bring it half way back to the center by adjusting the leveling
screw which is parallel to the plate vial.
Correcting the remaining half by adjusting the bubble adjusting screws with the adjusting
pin.
Confirm that the bubble does not move from the center when the instrument is rotated
by 180°.If not,repeat above steps.
Turn the instrument around 90°and adjust the third screw to center the bubble in the
vial. Repeat inspection and adjustment steps until the bubble remains in center in any
directions.
