Bosch GLM 40 - Инструкция по эксплуатации - Страница 31

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Bosch Power Tools

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Display Illumination

The display illumination is continuously switched on. When no button is pressed, the 
display illumination is dimmed after approx. 10 seconds to preserve the batteries/re-
chargeable batteries. When no button is pressed for after approx. 30 seconds, the 
display illumination goes out.

Working Advice

General Information

The reception lens 

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 and the laser beam outlet 

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 must not be covered when taking 

a measurement.

The measuring tool must not be moved while taking a measurement. Therefore, place 
the measuring tool, as far as this is possible, against or on a firm stop or supporting 
surface.

Influence Effects on the Measuring Range

The measuring range depends on the lighting conditions and the reflective properties 
of the target surface. For better visibility of the laser beam in extraneous light, use the 
laser viewing glasses 

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 (accessories) and the laser target plate 

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 (accessories) or 

shade the target area.

Influence Effects on the Measuring Result

Due to physical effects, faulty measurements cannot be excluded when measuring on 
different surfaces. Included here are:

– Transparent surfaces (e. g., glass, water),
– Reflecting surfaces (e. g., polished metal, glass),
– Porous surfaces (e. g. insulation materials),
– Structured surfaces (e. g., roughcast, natural stone).

If required, use the laser target plate 

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 (accessory) on these surfaces.

Furthermore, faulty measurements are also possible when sighting inclined target 
surfaces.

Also, air layers with varying temperatures or indirectly received reflections can affect 
the measured value.

Accuracy Check of the Distance Measurement

The accuracy of the measuring tool can be checked as follows:
– Select a permanently unchangeable measuring section with a length of approx. 3 

to 10 metres; its length must be precisely known (e. g. the width of a room or a door 
opening). The measurement should be carried out under favourable conditions, 
meaning, the measuring distance must be indoors and the target surface for the 
measurement must be smooth and reflect well.

OBJ_BUCH-2264-001.book  Page 31  Thursday, August 14, 2014  4:14 PM