Influences On Accuracy; Checking The Height Accuracy Of The Horizontal Line; Leveling Accuracy - Bosch GLL 2-15 Instrucciones De Funcionamiento Y Seguridad

Influences on Accuracy
The ambient temperature has the greatest
influence, especially temperature differences
occurring from the ground upward can divert
the laser beam.
As thermal fluctuation is closest to the ground,
if possible the tool should be mounted on a
commercially available tripod and placed in the
center of the work area.
Apart from exterior influences (such as heavy
impact or falling down) can lead to deviations.
Therefore, check the accuracy of the tool each
time before starting your work.
First, check both the height as well as the
leveling accuracy of the horizontal and vertical
laser line.
Should the tool exceed the maximum deviation
during one of the tests, please have it repaired
by a Bosch after-sales service.
Checking the Height Accuracy of the
Horizontal Line
For this check, a free measuring distance of
approximately 16 feet (5 m) on a firm surface
between two walls A and B is required.
– Mount the tool onto a tripod or place it on a
firm and level surface close to wall A. Switch
on the tool.
A
A
– Direct the laser against the close wall A and
allow the tool to level in. Mark the center of
the point where the laser lines cross each
other on the wall (point I).
A
180°
A
180°
Leveling Accuracy
16 ft
16 ft
– Turn the tool by 180°, allow it to level in and
mark the cross point of the laser lines
on the opposite wall B (point II).
– Without turning the tool, position it close to
wall B. Switch the tool on and allow it
to level in.
A
A
– Align the height of the tool (using a tripod or
by underlaying, if required) in such a
manner that the cross point of the laser
lines is projected against the
previously marked point II on the wall B.
A
A
d
d
B
B
– Without changing the height, turn around
the tool by 180°. Direct it against the
wall A in such a manner that the vertical
laser line runs through the already marked
point I. Allow the tool to level in and mark
the thecross point of the laser lines on the
wall A (point III).
– The difference d of both marked points I
and III on wall A indicates the actual
height deviation of the tool.
The maximum permitted deviation d
calculated as follows:
d = double distance of the walls x 0.0036 in/
max
B
ft (0.3 mm/m)
B
Example: With a 16 ft (5 m) distance between
the walls, the maximum deviation must not
exceed d
max
(2 x 5 m x 0.3 mm/m = 3 mm) in Thus, the
marks must not be more than 0.1152 (3 mm) of
an inch apart.
-10-
180°
180°
= 2 x 16 ft x 0.0036 in/ft = 0.1152
B
B
B
B
is
max