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.
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
Distance Between Walls
Allowable Deviation ± 1/8" (± 3.18mm) ± 1/4" (± 6.35mm) ± 3/8" (± 9.53mm)
33' (10m) 66' (20m)
b
a1
100' (30.5m)
Step 2: Checking the Leveling Accuracy of the Horizontal Line For this check, a 16' (5m) or 30' (9m) distance to the opposite wall in a dimly lit room is required. 1. Place the instrument on a firm and level surface or mount the instrument onto a tripod at the specified distance from wall A. 2. Turn on the instrument in the self-leveling mode by sliding the Pendulum Switch 2 to the UNLOCK position. 3. Direct the laser beam against wall A (Pos.1) and allow a few seconds for the visible line to stabilise. Mark the center of the horizontal line projected by the instrument on wall A (point a1).
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).
A
B
A
b
a1
a2
a1
Pos.1
16' (5m)
20
21
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