Checking The Levelling Accuracy In The Horizontal Position; Checking The Levelling Accuracy In The Vertical Position (Grl 500 Hv); Calibrating The Measuring Tool; X-Axis Calibration - Bosch Professional GRL 500 HV Manual

OBJ_BUCH-1960-004.book Page 44 Thursday, October 13, 2016 12:38 PM
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.
If the measuring tool exceeds the maximum deviation in one
of the measuring procedures described below, perform a cal-
ibration (see "Calibrating the Measuring Tool", page 44) or
have the measuring tool checked by a Bosch customer service
agent.
Checking the Levelling Accuracy in the Horizontal Posi-
tion
A free measuring distance of 30 m on a firm surface in front of
a wall is required for the check. A complete measuring proce-
dure each must be carried out for the X- and Y-axis.
– Mount the measuring tool in the horizontal position onto a
– After the levelling, mark the centre of the laser beam on the
– Rotate the measuring tool by 180°, allow it to level in and
– The difference d of both marked points I and II on the wall
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 on the 30 m measuring
distance is as follows:
30 m x ±0.05 mm/m = ±1.5 mm.
The difference d between points I and II must therefore be
maximum 3 mm in each of the two measuring procedures.
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tripod or place it on a firm and level surface at a distance of
30 m to the wall. Switch the measuring tool on.
wall (point I).
30 m
mark the centre point of the laser beam on the wall
(point II). Take care that point II is as vertical as possible
above or below point I.
d
results in the actual height deviation of the measuring tool
for the measured axis.
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Checking the Levelling Accuracy in the Vertical Position
(GRL 500 HV)
A free measuring distance of 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 tri-
pod, or place it on a firm and level surface. Switch the
measuring tool on and allow it to level.
– Align the measuring tool such that the laser beam impinges
centrally on the plumb bob rope at the upper end. The dif-
ference d between laser beam and plumb bob rope at the
bottom end of the rope results in the deviation of the meas-
uring tool to the vertical line.
The maximum permitted deviation over a 10 m high measur-
ing distance is as follows:
10 m x ±0.1 mm/m = ±1 mm.
The difference d must therefore be maximum 1 mm.

Calibrating the Measuring Tool

The following tasks should be performed only by well-trained
and qualified persons. The legalities with regard to perform-
ing an accuracy check or calibration of a measuring tool must
be known.
 Perform calibration of the measuring tool meticulously
or have the measuring tool checked by a Bosch custom-
er service agent. Inaccurate calibration leads to incorrect
measuring results.
180°
 Start the calibration only if you have to perform a cali-
bration of the measuring tool. As soon as the measuring
tool is in calibration mode, you must perform the calibra-
tion meticulously to the end in order to ensure that no in-
correct measuring results are produced afterwards.
Note: After calibration, the indicators for checking calibration
are not displayed again until the cause of the calibration warn-
ing occurs again.
A free measuring distance of at least 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 tri-
pod 63 (accessory).
– Place the tripod 30 m in front of the wall. The X-axis indica-
tor imprinted on the measuring tool must be pointing per-
pendicular to the wall.
– Switch the measuring tool on.
d
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