15
en
Checking the horizontal laser line level
Be sure to adhere as closely as possible to the orientation
of the unit as shown.
1. Place the LAR 300 on a horizontal surface or on a tripod
at a distance of 5 or 10 m (25 or 50 ft) from a wall, with
the operator panel towards the wall.
2. Switch the laser unit on (button (3)) and wait until it has
automatically levelled itself.
3. Mark the centre of the visible laser line on the wall –
measurement 1 (point 1). A receiver can also be used.
4. Rotate the entire laser unit through 90° without alter-
ing the height of the laser
(i.e. do not change the tripod
height). Allow the unit to
level itself again.
5. Mark the centre of the laser line on the wall (point 2).
6. Repeat steps 4 and 5 twice to obtain points 3 and 4.
If the differences between the four control points are less
than 1 mm distance of 5 m (1/16” at 25 ft) or less than 2 mm
for a distance of 10 m (1/8” at 50 ft), the unit is within its
permitted tolerance of ± 0.1 mm/m (± 18” over 100ft). Here
points 1 and 3 correspond to the unit’s x-axis and points 2
and 4 to its y-axis.
12.2 Horizontal check
The LAR 300 rotation laser from STABILA is designed for
use on building sites and is perfectly adjusted before
leaving our premises. As with all precision instruments,
you should regularly check the calibration accuracy of
the unit. Always check the unit before you start work,
especially if it has been exposed to heavy vibrations.
Horizontal check
12.1 Checking accuracy
5 m / 25 ft
10 m 50 ft
1
1
2
Y
1
1
X
X
Y
2
3
1
2
2
1
X
X
3
4
3
1
2
5 m
≤ 1 mm
10 m
≤ 2 mm
Maximum
permissible
difference:
3
2
1
Y
Y
4
25 ft
≤ 1/16”
50 ft
≤ 1/8”
Summary of Contents for LAR 300
Page 1: ...Operating instructions...
