ADA INSTRUMENTS PROF X2, Operating Manual

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11
MEASUREMENT FOUNDATION
6. ADJUSTING THE THEODOLITE
8. Stadia measurement.
There are two pairs of short hairs on the graduated plate of the telescope, i.e. stadia hairs. They are used to measure the
distance between the target to be measured and the measurement point of the instrument.
Assume the distance between the staff and the measuring point is D. The length cut by a pairs of the stadia hairs on the scale
is L and constants of the stadia are K and C which are 100 and 0 respectively. The distance measurement formula is following:
D=KL+C-100L
Formula of horizontal distance, taking into account a slope:
D=KLC*OS a , where a- a vertical angle of slope
Formula for calculation the exceeding between points:
H=0,5 kL 1-v , where l- height of theodolite, v- height of aiming at the staff.
9. Using the rotary circle mechanism.
Theodolites Prof X2 are equipped with a rotary circle knob (5). It enables the reading value of the horizontal graduated
circle to be placed in the direction of the target to be measured. To avoid errors, it is necessary to aim at the target, to press the
locking catch of the rotary knob (5) and press the knob (5) simultaneously. Then, rotating the knob (5) in the counter-clockwise
direction, set the necessary reading. After this procedure press the locking catch again to unlock the limb.
All instruments are adjusted and checked and then transported to users after careful packing. But nevertheless before usage it is
necessary to repeat the adjustment as the transportation and storing conditions may tend to engender the possibility of deviation
from correct positions adjusted originally.
Such adjustment should be done as follows:
1. Adjusting the tubular level of the alidade
Turn the alidade so as to enable the tubular level to be parallel with the line connecting the centers of any two of foot screws.
PROF
X2 X2