27
? Perpendicular Degree of the Visual Axis to the Horizontal Axis
Inspection
? Set two obvious targets as high as the instrument about 100 meters apart with
the instrument in their center point.
Level the instrument precisely and power it on.
? Aim at target A using crosshair of the telescope plate-leftward.
? Loosen the vertical braking knob. Rotate the telescope around the horizontal axis
180° to aim it at the opposite direction.
?
Aim at target B with the same distance to target A
?
Rotate the horizontal braking knob to turn the instrument 180°.
Aim at the target A, then lock the knob.
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Rotate the vertical braking knob to turn the instrument 180°. Aim at the target C.
Target C should be superposed to target B. If not, adjustment is necessary.
