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Align the height of the horizontal laser line (using the tripod or by placing objects
8.
underneath the instrument as required) with the previously marked point b on wall B.
A
a1
Without changing the height, rotate the instrument 180° to direct the laser beam toward
9.
wall A.
Allow the instrument to self-level and mark the center of the horizontal line on wall A
10.
(point a2).
A
a1
a2
B
b
B
b
20
Measure the vertical distance between a1 and a2 that indicates the actual height
11.
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
33' (10m)
66' (20m)
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.
Place the instrument on a firm and level surface or mount the instrument onto a tripod at
1.
the specified distance from wall A.
Turn on the instrument in the self-leveling mode by sliding the Pendulum Switch
2.
the UNLOCK position.
Direct the laser beam against wall A (Pos.1) and allow a few seconds for the visible line
3.
to stabilise. Mark the center of the horizontal line projected by the instrument on wall A
(point a1).
A
Allowable Deviation
± 1/8" (± 3.18mm)
± 1/4" (± 6.35mm)
± 3/8" (± 9.53mm)
a1
Pos.1
16' (5m)
21
to
2
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