Bedienungsanleitung Bosch GPL 3 (Seite 11 von 178) (Deutsch, Englisch, Holländisch, Dänisch, Französisch, Italienisch, Portugiesisch, Spanisch, Polnisch, Türkisch, Schwedisch, Norwegisch, Finnisch)

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English | 11

Bosch Power Tools 1 609 92A 0KW | (16.5.14)

If the automatic levelling function is not possible, e.g. be-

cause the surface on which the measuring tool stands devi-

ates by more than 5 ° or 3 ° from the horizontal plane, the laser

beams flash rapidly. In this case, bring the measuring tool to

the level position and wait for the self-levelling to take place.

As soon as the measuring tool is within the self-levelling range

of ±5° or ±3° respectively, all laser beams light up continu-

ously again.

In case of ground vibrations or position changes during oper-

ation, the measuring tool is automatically levelled in again. To

avoid errors by moving the measuring tool, check the position

of the laser beams with regard to the reference points upon

re-levelling.

Levelling Accuracy

Influences on Accuracy

The ambient temperature has the greatest influence. Especially

temperature differences occurring from the ground upward

can divert the laser beam.

As thermal fluctuation is largest close to the ground, the

measuring tool, if possible, should be mounted on a commer-

cially available tripod and placed in the centre of the working

area.

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 before starting your work.

Should the measuring tool exceed the maximum deviation

during one of the tests, please have it repaired by a Bosch af-

ter-sales service.

Checking the Horizontal Levelling Accuracy

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.

– Direct the horizontal laser beam against the close wall A

and 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.

– Rotate the measuring tool by 180° without changing the

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

laser beam on wall A (point III). Take care that point III is

as vertical as possible above or below point I.

– The difference d of both marked points I and III on wall A

indicates the actual height deviation of the measuring tool.

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 III may not ex-

ceed 12 mm (max.).

20 m

180˚

OBJ_BUCH-807-004.book Page 11 Friday, May 16, 2014 7:51 AM

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