Bosch GRL 300 HV Manual page 7

OBJ_BUCH-757-009.book Page 25 Monday, December 7, 2015 2:02 PM
Pressing the line operation button again takes you back to
line operation with the smallest aperture angle.
Note: Due to inertia, it is possible for the laser to slightly move
beyond the end point of the laser line.
Rotating the Laser Line/Laser Dot or the Ro-
tational Plane (see figure A)
When the measuring tool is in the horizontal position, the la-
ser line (in line operation) or the laser dot (in point operation)
can be positioned within the rotational plane of the laser. Ro-
tation is possible by 360°.
For this, manually turn the rotation head 10 to the desired po-
sition or use the remote control: Press button 28 to rotate in
clockwise direction, and button 29 on the remote control to
rotate in anticlockwise direction. In rotational operation,
pressing the buttons has no effect.
When the measuring tool is in the vertical position, it is pos-
sible to rotate the laser point, laser line or rotational plane
around the vertical axis. Rotating is possible only within the
self-levelling range (5° leftwards or rightwards) and only with
the remote control.
Press button 28 on the remote control to rotate in clockwise
direction, and button 29 on the remote control to rotate in an-
ticlockwise direction.
Automatic Levelling of the Rotational Laser Level
Overview
After switching on, the measuring tool automatically detects
the horizontal or vertical position. To change between the
horizontal and vertical position, switch the measuring tool off,
reposition it and switch on again.
After switching on, the measuring tool checks the horizontal
and vertical position and automatically levels out any uneven-
ness within the self-levelling range of approx. 8 % (5°).
When the measuring tool is inclined by more than 8 % after
switching on or after a position change, levelling in is no long-
er possible. In this case, the rotor is stopped, the laser flashes
and levelling indicator 3 continuously lights up red. Reposi-
tion the measuring tool and wait for it to re-level. Without re-
positioning, the laser is automatically switched off after
2 minutes and the measuring tool after 2 hours.
When the measuring tool is levelled in, it continuously checks
the horizontal and vertical position. Automatic re-levelling
takes place after position changes. To avoid faulty measure-
ments, the rotor stops during the levelling process, the laser
flashes and the levelling indicator 3 flashes green.
Shock-warning Function
The measuring tool has a shock-warning function; after posi-
tion changes or shock to the measuring tool, or in case of
ground vibrations, it keeps the measuring tool from levelling
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 1 continu-
ously lights up green, and the shock-warning function is ac-
tivated after 30 seconds.
Bosch Power Tools
When the levelling-accuracy range is exceeded after a posi-
tion change of the measuring tool or when heavy ground vi-
brations are detected, the shock-warning function is actuat-
ed: The rotation is stopped, the laser flashes, the levelling
indicator 3 goes out and the shock-warning indicator 1 flash-
es red. The current operating mode is stored.
– After the shock warning has actuated, press the shock-
warning button 2 on the measuring tool or the shock-warn-
ing reset button 27 on the remote control. The shock-
warning function is restarted and the measuring tool starts
the levelling. As soon as the measuring tool is levelled in
(levelling indicator 3 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.
When, after the shock-warning function has actuated, the
function is not restarted by pressing button 2 on the measur-
ing tool or the shock-warning reset button 27 on the remote
control, the laser is automatically switched off after 2 minutes
and the measuring tool after 2 hours.
– To switch off the shock-warning function, press shock-
warning button 2 once, or, when the shock warning is actu-
ated (shock-warning indicator 1 flashing red) press it
twice. When the shock-warning function is shut off, the
shock-warning indicator 1 goes out.
The shock-warning function cannot be switched on or off with
the remote control; it can only be restarted after having actu-
ated.
Levelling Accuracy of the Rotational Laser Level
Influences on Accuracy
The ambient temperature has the greatest influence. Espe-
cially temperature differences occurring from the ground up-
ward can divert the laser beam.
The deviations play a role in excess of approx. 20 m measur-
ing distance and can easily reach two to four times the devia-
tion at 100 m.
Because the largest difference in temperature layers is close
to the ground, the measuring tool should always be mounted
on a tripod when measuring distances exceeding 20 m. If pos-
sible, also set up the measuring tool in the centre of the work
area.
Accuracy Check of the Measuring Tool
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
this reason, check the levelling accuracy each time before be-
ginning work.
For the accuracy check, an unobstructed measuring distance
of 20 m on firm ground between two walls A and B is required.
With the measuring tool in the horizontal position, a transit
measurement is to be carried out across both axes X and Y
(both positive and negative) (altogether 4 complete measure-
ments).
– Montieren Sie das Messwerkzeug in Horizontallage nahe
der Wand A auf einem Stativ 37 (Zubehör) oder stellen Sie
es auf einen festen, ebenen Untergrund. Schalten Sie das
Messwerkzeug ein.
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