Bosch GCL 25 Professional User Manual

Page 14

14 | English

1 618 C00 50R | (9.7.12)

Bosch Power Tools

Checking the Horizontal Levelling Accuracy of the Lateral

Axis
A free measuring distance of 20 m on a firm surface in front of

a wall is required for the check.
– Mount the measuring tool onto the holder or a tripod, or

place it on a firm and level surface at a distance of 20 m to

the wall. Switch the measuring tool on and select 5-point

operation.

– Direct one of the two lateral laser beams, that run along-

side the lateral axis of the measuring tool, at the wall. Allow

the measuring tool to level in. Mark the centre of the laser

beam on the wall (point I).

– Rotate the measuring tool by approx. 180° without chang-

ing its height. Allow it to level in and mark the centre point

of the other lateral laser beam on the wall (point II). Take

care 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

alongside the lateral axis.

On the measuring distance of 2 x 20 m = 40 m, the maximum

allowable deviation is:

40 m x ±0.3 mm/m = ±12 mm.

Thus, the difference d between points I and II may not exceed

12 mm (max.).

Checking the Horizontal Levelling Accuracy of the Longi-

tudinal Axis
A free measuring distance of 20 m on a firm surface between

two walls A and B is required for the check.
– Mount the measuring tool onto the holder or a tripod, or

place it on a firm and level surface close to wall A. Switch

the measuring tool on and select 5-point operation.

– Direct the horizontal laser beam, which runs parallel to the

longitudinal axis of the measuring tool, at the close wall A.

Allow the measuring tool to level in. Mark the centre of the

laser beam on the wall (point I).

– Turn the measuring tool around by 180°, allow it to level in

and mark the centre point of the laser beam on the oppo-

site wall B (point II).

– Without turning the measuring tool, position it close to wall

B. Switch the measuring tool on and allow it to level in.

– Align the height of the measuring tool (using the tripod or

by underlaying, if required) in such a manner that the cen-

tre point of the laser beam is projected exactly against the

previously marked point II on wall B.

20 m

180°

20 m

180°

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