Bosch GRL 500 H Consignes De Fonctionnement/Sécurité page 28

– After the leveling, mark the center of the
laser beam on the wall (point I).
– Rotate the measuring tool by 180°, allow
it to level in and mark the center point
of the laser beam on the wall (point II).
Make sure that point II is as vertical as
possible above or below point I.
– The difference d of both marked points
I and II on the wall results in the actual
height deviation of the measuring tool for
the measured axis.
Repeat the measuring procedure for the
other axis. For this, turn the measuring
tool by 90° before starting the measuring
procedure.
The maximum permitted deviation over the
recommended calibration distance of 100 ft
(30 m) is as follows:
100 ft x 1/16 in= ± 1/16 in
(30 m x 0.05 mm = ± 1.5 mm)
The difference d between points I and II
must therefore be maximum 1/8 in (3 mm) in
each of the two measuring procedures.
Checking the Leveling Accuracy in the
Vertical Position (GRL 500 HV)
A free measuring distance of 30 ft (10 m) on
a firm surface in front of a wall is required for
the check. Fasten a plumb bob rope to the
wall.
– Mount the measuring tool in the vertical
position onto a tripod, or place it on a firm
and level surface. Switch the measuring
tool on and allow it to level.
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– Align the measuring tool such that the
laser beam impinges centrally on the
plumb bob rope at the upper end. The
difference d between laser beam and
plumb bob rope at the bottom end of
the rope results in the deviation of the
measuring tool to the vertical line.
The maximum permitted deviation over a
30 ft (10 m) high measuring distance is as
follows:
30 ft x 1/8 in at 100 ft = ±3/64 in
(10m x ±0.1 mm/m= ±1 mm).
The difference d must therefore be maximum
3/32 in (2mm).
Calibrating the Measuring Tool
Perform calibration of the measuring tool
meticulously or have the measuring tool
checked by a Bosch customer service
agent. Inaccurate calibration leads to
incorrect measuring results.
Note: After calibration, the indicators for
checking calibration are not displayed again
until the cause of the calibration warning
occurs again.
A free measuring distance of at least 100 ft
(30 m) on a firm surface in front of a straight
wall is required for the calibration.
Always calibrate all axes (GRL 500 H: X-axis
and Y-axis; GRL 500 HV: X-axis, Y-axis and
Z-axis).
X-Axis Calibration
– Mount the measuring tool in the horizontal
position on a tripod 63 (accessory).
– Place the tripod 100 ft (30 m) in front of
the wall. The X-axis indicator imprinted
on the measuring tool must be pointing
perpendicular to the wall.
– Switch the measuring tool on.
– Simultaneously press the
calibration button 25 and the
slope button 18 for approx. 2 s.
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