Bosch GLM 50 C Professional Originalbetriebsanleitung Seite 42

OBJ_BUCH-2450-005.book Page 42 Thursday, August 25, 2016 8:38 AM
42 | English
General Information
The reception lens 14 and the laser beam outlet 15 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 18 (accessories) and the laser target plate 17 (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 17 (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 and Calibration of the Grade Measurement (see figure G)
Regularly check the accuracy of the grade measurement. This is done by carrying out
a reversal measurement. For this, place the measuring tool on a table and measure
the grade. Turn the measuring tool by 180 ° and measure the grade again. The differ-
ence of the indicated reading may not exceed by more than 0.3 ° (max.).
In the event of larger deviations, you have to recalibrate the measuring tool. For this,
select . Follow the instructions on the display.
CAL
After severe temperature changes and impact, we recommend an accuracy check
and, if required, to recalibrate the measuring tool. After a temperature change, the
measuring tool must acclimate for a while before calibrating.
1 609 92A 23J | (25.8.16) Bosch Power Tools