DeWalt DW089-XE Instruction Manual page 10

CHECKING ACCURACY – VERTICAL BEAMS (FIG. 8)
Checking the vertical (plumb) calibration of the laser can be most accurately done
when there is a substantial amount of vertical height available, ideally 9 m (30'), with
one person on the floor positioning the laser and another person near a ceiling to
mark the position of the beam. It is important to conduct a calibration check using
a distance no shorter than the distance of the applications for which the tool will be
used.
1. Place the laser on the floor and turn on both vertical beams.
2. Mark the position where the beams cross on the floor (F) and also on the ceiling
(G). Always mark the center of the beams' thickness.
3. Rotate the laser 180 degrees, and reposition it so the beam crossing is exactly
on the original mark (F) on the floor.
4. Mark the position where the beams cross on the ceiling (H).
FIG. 8
STEP 2
G
STEP 1
F
STEP 2
5. Measure the distance between the two ceiling marks (G, H). If the measurement
is greater than the values shown below, the laser must be serviced at an
authorized service center.
Ceiling Height
2.5 m (8')
3.0 m (10')
4.0 m (14')
6.0 m (20')
9.0 m (30')
STEP 5
G
H
STEP 4
STEP 3
f
8
Allowable Distance Between Marks
1.5 mm (1/16")
2.0 mm (3/32" )
2.5 mm (1/8")
4.0 mm (5/32")
6.0 mm (1/4")