Shock-Warning Function; Accuracy Check - Bosch GRL 400 H Mode D'emploi

Automatic re-leveling takes place after position changes.
To avoid faulty measurements, the rotor stops during the
leveling process, the laser flashes and the leveling indicator
1 flashes green.

Shock-warning Function

The laser tool has a shock-warning function; after
position changes or shock to the laser tool, or in
case of ground vibrations, it keeps the laser tool
from leveling in at changed heights, and thus prevents
vertical errors.
To switch on the shock-warning function, press the
shock-warning button 2. The shock-warning indicator
3 continuously lights up green, and the shock-warning
function is activated after 30 seconds.
When the leveling-accuracy range is exceeded after a
position change of the laser tool or when heavy ground
vibrations are detected, the shock-warning function is
actuated: The rotation is stopped, the laser flashes, the
leveling indicator 1 goes out and the shock-warning
indicator 3 flashes red. The current operating mode is
stored.
After the shock-warning function has actuated, press the
shock-warning button 2.
The shock-warning function is restarted and the laser tool
starts the leveling. As soon as the laser tool is leveled in
(leveling indicator 1 continuously lights up green), it starts
in the stored operating mode. Now, check the height of the
laser beam with a reference point and correct the height,
if required.

Accuracy Check

Apart from exterior influences, device-specific
influences (such as heavy impact or being dropped) can
lead to deviations. Therefore, check the accuracy of the
laser tool each time before starting your work.
For the accuracy check, an unobstructed measuring
distance of 100 ft (30m) from a wall on a tripod on firm
ground or a level, sturdy surface is required.
– Mount the laser tool in the horizontal position onto a
100'
(30m)
Accuracy Check
C
X Axis Facing the Target
(i.e. wall, receiver)
-10-
When the function is not restarted by pressing button 2
after the shock-warning function has actuated, the laser
is automatically switched off after 2 minutes and the laser
tool after 2 hours.
To switch off the shock-warning function, press shock-
warning button 2 once, or, when the shock warning is
actuated (shock-warning indicator 3 flashing red) press it
twice. When the shock-warning function is shut off, the
shock warning indicator 3 goes out.
Influences on Accuracy
The ambient temperature has the greatest influence.
Especially temperature differences occurring from the
ground upward can divert the laser beam.
The deviations play a role in excess of approx. 65 ft
measuring distance and can easily reach two to four times
the deviation at 328 ft.
Because the largest difference in temperature layers
is close to the ground, the laser tool should always be
mounted on a tripod when measuring distances exceeding
65 ft. If possible, also set up the laser tool in the center of
the work area.
tripod or place it on a firm and level surface 100 ft
(30m) from a wall. Face the X axis (Y axis) towards the
wall. Switch the laser tool on.
– After leveling, use the laser receiver or
visible line to mark the position of the laser
line on the wall (Position A).
– L o o s e n t h e l a s e r t o o l f r o m t h e t r i p o d
and rotate the laser tool 180°. Ensure that
the height of the tripod does not change, as this will
A
B
Y Axis