9. Without changing the height, rotate the instrument 180° to direct the laser beam toward wall A. 10. Allow the instrument to self-level and mark the center of the horizontal line on wall A (point a2).
5. Slide the Pendulum Switch 2 to the LOCK position. 6. Without turning the instrument, place it close to wall B. 7. Slide the Pendulum Switch 2 to the UNLOCK position and allow the visible line to stabilize. 8. Align the height of the horizontal laser line (using the tripod or by placing objects underneath the instrument as required) with the previously marked point b on wall B .
A
B
b
a1
A
B
a2
b
a1
11. Measure the vertical distance between a1 and a2 that indicates the actual height deviation of the instrument. If the actual deviation is greater than the Allowable Deviation for the corresponding Distance Between Walls in the table below, the instrument must be serviced. Distance Between Walls Allowable Deviation 16' (5m) 5/32" (4mm) 30' (9m) 5/16" (8mm)
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