Troubleshooting - Causes And Corrective Measures; Checking The Measuring Tool - Bosch GLM 20 Original Instructions Manual

en 18 | GLM 20 | Working Advice
6.4 Troubleshooting – Causes and Cor-
rective Measures
Cause
Temperature warning indicator (b) flashing; measurement not
possible
Measuring tool not within the oper-
ating temperature range between
–10 °C and +40 °C.
Battery low indicator (a) appears
Battery voltage decreasing (mea-
surement still possible).
Battery low indicator (a) flashing; measurement not possible
Battery voltage too low
Indicator "––––" appears on the display
The measuring tool was moved too
quickly.
The measuring object is outside of
the range of the laser beam.
All indicators on the display flash
The measuring tool is defective.
The laser beam outlet 8 or the
reception lens 7 are misted up
(e.g. due to a rapid temperature
change).
"Err" indicator appears after the On/Off button is pressed
Unreliable measuring result
The target surface does not reflect
correctly (e.g. water, glass).
The laser beam outlet 8 or the re-
ception lens 7 are covered.
Measuring result not plausible
Obstruction in path of laser beam
The measuring tool monitors the proper function for
each measurement. When a defect is detected, all
indicators on the display flash. In this case, or when
the corrective measures listed above cannot correct the
error, have your dealer forward the measuring tool to an
authorised Bosch aftersales service.
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Corrective Measure
Wait until the measuring
tool has reached the oper-
ating temperature
Replace batteries
Replace batteries
Move the measuring tool
more slowly.
Go closer to the measur-
ing object.
Contact the Customer Ser-
vice
Wipe the laser beam out-
let 8 and/or the recep-
tion lens 7 dry using a soft
cloth
Cover off the target sur-
face
Make sure that the laser
beam outlet 8 or the re-
ception lens 7 are unob-
structed
Laser point must be com-
pletely on target surface.
6.5

Checking the Measuring Tool

The accuracy of the measuring tool can be checked as
follows:
$
Select a permanently unchangeable measuring
section with a length of approx. 1 to 10 metres;
its length must be precisely known (e.g. the
width of a room or a door opening). The measur-
ing distance must be indoors; the target surface
for the measurement must be smooth and reflect
well.
$
Measure the distance 10 times in succession.
Under favourable conditions, the deviation of the in-
dividual measurements from the mean value must not
exceed ±1.6 mm (max.) over the complete measuring
distance. Log the measurements, so that you can com-
pare their accuracy at a later point of time.
Robert Bosch GmbH