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16
Before using the instrument or after long transportation, the leveling accuracy and
indication accuracy.
1. Adjust the instrument with leveling screw knob 9, so that the air bubble is in the center
of circular vial.
1. Rotate the leveling screw knob 9 to ensure the air bubble moving toward to the
center of circular bubble vial, the deviation should be at 1/2 between the center
and the end position(see fig.8)
2. Use align wrench turn the two adjustment screws till the air bubble moving to the
center of circular bubble vial.(see fig.9)
1. Checking should be done at a distance of 30m. Place the instrument in the center of
this distance, put 2 leveling rod at the both end of measuring distance A and B
separately.˄see fig.10)
2. Read off the heights of this two leveling rod, calculate the difference d; that is the
difference between a1(the height of leveling rod A) and b1(the height of leveling rod B).
3. Repeat the above step till the air bubble keep in the center of circular bubble vial
no matter which direction the telescope turned.
2. Rotate the unit by 180e, the air bubble should keep in center, if the air bubble moves
out of center, the circular bubble vial must be readjusted.
5.1 Check Circular Bubble Vial
5.2 Adjusting Circular Bubble Vial
5.3 Checking i angle
5. Checking and Adjusting
fig.8 fig.9
rotate leveling screw knob bubble adjusting screw
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