Bedienungsanleitung Bosch GLL 3-50 Professional (Seite 15 von 245) (Deutsch, Englisch, Holländisch, Dänisch, Französisch, Italienisch, Portugiesisch, Spanisch, Polnisch, Türkisch, Schwedisch, Norwegisch, Finnisch)

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English | 15

Bosch Power Tools 1 609 92A 0KM | (19.11.14)

– Vertical operation (operating modeC): generates two ver-

tical, orthogonal laser lines,

– Horizontal operation combined with vertical operation

(operating mode D): generates a horizontal and two verti-

cal laser lines

In all operating modes, a perpendicular point is projected on-

to the floor.

Once switched on, the measuring tool is in operating mode

“D”. To change the operating mode, press the operating

mode button 4.

All four operating modes can be selected with or without auto-

matic levelling.

In cross-line and vertical operation, the vertical lines can be

aligned exactly on a measurement object using the handwheel

18.

Pulse Function

When working with the laser receiver 27, the pulse function

must be activated, – independent of the selected operating

mode.

In pulse function, the laser lines flash at very high frequency

and thus become detectable by the laser receiver 27.

To switch on the pulse function, press button 3. When the

pulse function is switched on, the pulse-function indicator 2

lights up green.

When the pulse function is switched on, the visibility of the la-

ser lines is reduced for the human eye. Therefore, shut off the

pulse function by pushing button 3 again when working with-

out laser receiver. When the pulse function is switched off,

the pulse-function indicator 2 is deactivated.

Automatic Levelling

Working with Automatic Levelling

Position the measuring tool on a level and firm support or at-

tach it to a commercially available photographic tripod.

When working with automatic levelling, push the On/Off

switch 14 to the “ on” position.

After switching on, the levelling function automatically com-

pensates irregularities within the self-levelling range of ±4°.

The measuring tool is levelled in as soon as the laser lines no

longer flash.

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 4° from the horizontal plane, the laser

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

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

In case of ground vibrations or position changes during oper-

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

avoid errors, check the position of the horizontal and vertical

laser line with regard to the reference points upon re-level-

ling.

Working without Automatic Levelling

For work without automatic levelling, push the On/Off switch

14 to the “ on” position. When the automatic levelling is

switched off, the laser lines flash continuously.

When the automatic levelling is switched off, the measuring

tool can be held by hand or placed on an inclined surface. In

cross-line operation, the two laser lines do not necessarily run

at a right angle to each other.

Levelling Accuracy

Influences on Accuracy

The ambient temperature has the greatest influence. Espe-

cially temperature differences occurring from the ground up-

ward can divert the laser beam.

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.

In addition to external influences, device-specific influences

(e.g. falls or heavy impacts) can also lead to deviations. For

this reason, check the calibration each time before beginning

work.

First, check both the height as well as the levelling accuracy of

the horizontal laser line, then the levelling accuracy of the ver-

tical laser line.

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 Height Accuracy of the Horizontal Line

For this check, a free measuring distance of 5 m on a firm sur-

face between two walls A and B is required.

– Mount the measuring tool onto a tripod or place it on a firm

and level surface close to wall A. Switch on the measuring

tool. Select cross-line operation with automatic levelling.

– Direct the laser against the close wall A and allow the meas-

uring tool to level in. Mark the centre of the point where the

laser lines cross each other on the wall (point I).

5 m

180˚

OBJ_BUCH-1973-003.book Page 15 Wednesday, November 19, 2014 8:19 AM

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