Checking The Levelling Accuracy In The Horizontal Position; Checking The Levelling Accuracy In The Vertical Position (Grl500 Hv); Calibrating The Measuring Tool; X-Axis Calibration - Bosch GRL500 H Professional Original Instructions Manual

OBJ_BUCH-1960-005.book Page 44 Wednesday, March 28, 2018 11:41 AM
44 | English
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", page44) 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
tripod or place it on a firm and level surface at a distance of
30 m to the wall. Switch the measuring tool on.
– After the levelling, mark the centre of the laser beam on the
wall (point I).
30 m
– Rotate the measuring tool by 180° , allow it to level in and
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.
180°
d
– The difference d of both marked pointsI 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 on the 30 m measuring
distance is as follows:
30 mx±0.1 mm/m= ±3.0 mm.
The difference d between points I and II must therefore be
maximum 6 mm in each of the two measuring procedures.
1 609 92A 4DX | (28.3.18)
Checking the Levelling Accuracy in the Vertical Position
(GRL500 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.
d
The maximum permitted deviation over a 10 m high measur-
ing distance is as follows:
10 mx±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.
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 (GR L500 H: X-axis and Y-axis;
GRL500 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.
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