Db c – Bosch BL 200 GC Professional User Manual
Page 30
30 | English
1 609 929 L80 | (26.7.07)
Bosch Power Tools
Changing the Inclination of the Rotational
Plane
When the automatic levelling is switched off, the
rotational plane (as well as the laser point or the
laser line) can be rotated around the X- or the
Y-axis with the direction pushbuttons. For this,
the function of the four direction pushbuttons is
independent of the horizontal or vertical position
of the measuring tool and of the operating mode.
The rotational plane is rotated around the X-axis
(directions A and C in the figure) with the upper
20 and lower 23 direction pushbuttons. The left
21 and right 24 direction pushbuttons rotate the
rotational plane around the Y-axis (in directions
D and B in the figure).
In inclined operation in a single axis (horizontal
position), the rotational plane can be rotated
around the X-axis with the upper 20 and lower
23 direction pushbuttons; rotation around the
Y-axis is not possible.
Levelling accuracy
Influences on Accuracy
The ambient temperature has the greatest influ-
ence. Especially temperature differences occur-
ring from the ground upward can divert the laser
beam.
The deviations play a role in excess of approx.
20 m measuring distance and can easily reach
two to four times the deviation 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 possi-
ble, also set up the measuring tool in the centre
of the work area.
Accuracy Check of the Measuring Tool
Apart from exterior influences, device-specific
influences (such as heavy impact or falling
down) can lead to deviations. Therefore, check
the accuracy of the measuring tool each time be-
fore starting your work.
For the accuracy check, an unobstructed meas-
uring distance of 20 m on firm ground between
two walls A and B is required. With the measur-
ing tool in the horizontal position, a
–
transit
measurement is to be carried out across both
axes X and Y (both positive and negative) (alto-
gether 4 complete measurements).
–
Mount the measuring tool in the horizontal
position onto a tripod 40 (accessory) or
place it on a firm and level surface near
wall A. Switch the measuring tool on.
BL
200
G
C
PRO
FE
SS
ION
AL
A
A
A
A
A
B
B
C
C
D
D
B
B
C
C
D
D
D
B
C
OBJ_BUCH-78-004.book Page 30 Thursday, July 26, 2007 2:04 PM