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20
E
5. Turn on the laser's horizontal beam and pivot the
laser back toward the rst end of the wall and
approximately parallel to the adjacent wall.
6. Adjust the height of the laser so that the center of
the beam is aligned with the nearest mark (b).
7. Mark the center of the beam (c) directly above or
below the farthest mark (a).
8. Measure the distance between these two marks
(a, c).
• If the measurement is greater than the values shown
below, the laser must be serviced at an authorized
service center.
Distance
Between Walls
Allowable Distance
Between
a
and
c
30' 1/4"
40' 5/16"
50' 13/32"
Distance
Between Walls
Allowable Distance
Between
a
and
c
9.0 m 6.2 mm
12.0 m 8.3 mm
15.0 m 10.4 mm
Checking Accuracy – Vertical Beam
(Fig. F)
Checking the vertical (plumb) calibration of the
laser can be most accurately done when there is a
substantial amount of vertical height available, ideally
20' (6 m), with one person on the oor 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. Start by marking a 5' (1.5 m) line on the oor.
2. Turn on the laser's vertical beam and position the
unit at one end of the line, facing the line.
3. Adjust the unit so its beam is aligned and centered
on the line on the oor.
4. Mark the position of the laser beam on the ceiling
(a). Mark the center of the laser beam directly over
the midpoint of the line on the oor.
5. Reposition the laser at the other end of the line on
the oor. Adjust the unit once again so its beam is
aligned and centered on the line on the oor.
6. Mark the position of the laser beam on the ceiling
(b), directly beside the rst mark (a).
7. Measure the distance between these two marks.
• If the measurement is greater than the values shown
below, the laser must be serviced at an authorized
service center.
• Ceiling Allowable Distance Between Marks Height 8'
Distance
Between Walls
Allowable Distance
Between
a
and
b
8' 1/16"
10' 3/32"
14' 1/8 "
20' 3/16"
Distance
Between Walls
Allowable Distance
Between
a
and
b
2.5 m 1.7 mm
3.0 m 2.1 mm
4.0 m 2.8 mm
6.0 m 4.1 mm
Plumb Dot Accuracy
Checking the plumb calibration of the laser can be most
accurately done when there is a substantial amount
of vertical height available, ideally 20' (6 m), with one
person on the oor positioning the laser and another
person near a ceiling to mark the dot created by the
beam on the ceiling.
• Mark point (a) on the oor, as shown in Figure
G
1
.
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