SLT12 User Manual
193
method.
4. Install the cover back to its original position.
Figure 17- 2
17.4 Perpendicularity of the Visualization Axis to the Horizontal
Axis
17.4.1 Check
1. Set target A at a distance of about 100 meters from the instrument and make the vertical
angle of the target within ±3°. Accurately level the instrument and turn on the power.
2. Aim the telescope at target A in the left position of the disk and read the horizontal angle.
Example: Horizontal angle L = 10°13′10″
3. Loosen the vertical and horizontal hand wheels, rotate the telescope, and rotate the right
side of the illumination plate to Aim at the same target A. Before illumination, tighten the
horizontal and vertical hand wheels, and read the horizontal angle.
Example: Horizontal angle R= 190°13′40″
4. 2C=L-(R±180°)=-30″≥±20″, need to be corrected.
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