Errors - Causes And Corrective Measures - Bosch GLM 40 Professional Manual Original

– Structured surfaces (e.g. roughcast, natural stone).
If necessary, use the laser target plate (13) (accessory) on these surfaces.
Inaccurate measurements are also possible where the laser is pointed at target surfaces
diagonally.
Layers of air at different temperatures and indirectly received reflections can also influ-
ence the measured value.
Accuracy Check of the Distance Measurement
You can check the accuracy of the measuring tool as follows:
– Choose a measuring section of approx. 3–10 m in length that is permanently un-
changed, the exact length of which is known to you (e.g. room width, door opening).
The measurement should be taken under favourable conditions, i.e. the measuring
section should be indoors and the target surface for the measurement should be
smooth and reflect well.
– Measure the section ten times in succession.
The deviation of the individual measurements from the mean value must not exceed ±
4 mm over the entire measuring section in favourable conditions. Record the measure-
ments in order to be able to compare the accuracy at a later date.
Errors – Causes and Corrective Measures
Cause
Temperature warning (b) flashes, measurement not possible
Measuring tool is outside of the operating
temperature range of -10 °C to +45 °C.
"Error" indicator in the display
Target surface is too reflective (e.g. mirror)
or not reflective enough (e.g. black mater-
ial), or ambient light is too bright.
The laser beam output (12) and/or recep-
tion lens (11) are fogged up (e.g. due to a
rapid temperature change).
Measurement result implausible
Target surface reflection not distinct (e.g.
water, glass).
Laser beam output (12) and/or reception
lens (11) are covered.
Bosch Power Tools
Corrective measures
Wait until the measuring tool has reached
operating temperature
Use the laser target plate (13)
Wipe the laser beam output (12) and/or re-
ception lens (11) dry with a soft cloth
Cover the target surface
Keep the laser beam output (12) and/or re-
ception lens (11) clear
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