120
paper..
4. Rotate the instrument, every 90° check contact ratio of laser point and intersection point.
5. If the laser point always coincided with the intersection point, no adjustment is
necessary.
Otherwise, the following adjustment is required..
Adjustment
1. Take off the protective cover
2. Fix the paper and mark the laser point on the paper every 90°. As shown in the picture:
Point A, B, C and D.
3. Line the Point AC and BD, the intersection point is 0.
4. Use Allen Key to adjust the four adjusting screws to make the center of the laser point
coincide with point 0..
5. Repeat the inspection and adjusting steps to be sure the adjustment is correct.
6. Replace the protective cover.
15.9 Instrument Constant (K)
The instrument constant has been checked and adjusted in the factor, K=0. It changes
seldom and it is suggested to check one or two times every year. The inspection should be
made on a base line but also can be made according to the following method.
Inspection
1. Mount and level the instrument on Point A in a flat area. Use the vertical hair to mark
