Step 2: Checking the Levelling 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).
4. Swivel the instrument 45° to the right to position 2 (Pos.2) and mark the horizontal line projected by the instrument on wall A (point a2). 5. Swivel the instrument 90° to the left to position 3 (Pos.3) and mark the horizontal line projected by the instrument on wall A (point a3).
a2
a1
d1
d2
A
a3
a1 a2
A
a3
a1
Pos.3
Pos.2
Pos.1
16' (5m)
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