Display Illumination; Working Advice - Bosch GLM 40 Original Instructions Manual

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 11 and the laser beam outlet 12 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 14 (accessories) and the laser target plate 13 (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 13 (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.
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