Step 3: Checking the Leveling Accuracy of the Vertical Line For this check, the most practical recommendation is to consider a door opening with at least 7' (2m) of height clearance and 8' (2.5m) of space to each side of the opening. 1. Position the instrument directly on a firm, level floor surface 8' (2.5m) away from the door opening. 2. Turn on the instrument in the self-leveling mode by sliding the Pendulum Switch 2 to the UNLOCK position. 3. Direct the vertical laser beam to the center of the opening and allow a few seconds for the visible laser line to stabilise. 4. Mark the center of the vertical laser line projected by the instrument in three locations: on the floor at the center of the door opening (point a) , at an 8' (2.5m) distance beyond the other side of the door opening (point b) , and at the upper edge of the door opening (point c1).
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
a3
c1
Pos.3
Pos.2
b
6. Measure the vertical distances between marks d1=a1-a2, d2=a1-a3 that indicate the actual deviation of the instrument. If any of the actual deviations is greater than the Allowable Deviation for the corresponding Distance to Wall in the following table, the instrument must be serviced.
a
Distance Between Walls
Allowable Deviation ± 1/8" (± 3.18mm) ± 1/4" (± 6.35mm) ± 3/8" (± 9.53mm)
33' (10m) 66' (20m)
100' (30.5m)
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