Bosch GLM 50 Professional Notice Originale page 16

OBJ_BUCH-1444-007.book Page 16 Thursday, June 9, 2016 1:34 PM
16 | English
function). 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 upon the light conditions and
the reflection properties of the target surface. For improved
visibility of the laser beam when working outdoors and when
the sunlight is intense, use the laser viewing glasses 19 (ac-
cessory) and the laser target plate 20 (accessory), or shade
off the target surface.
Influence Effects on the Measuring Result
Due to physical effects, faulty measurements cannot be ex-
cluded 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 20 (accessory) on these
surfaces.
Furthermore, faulty measurements are also possible when
sighting inclined target surfaces.
Also, air layers with varying temperatures or indirectly re-
ceived reflections can affect the measured value.
Accuracy Check of the Distance Measurement
The accuracy of the distance measurement 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 open-
ing). The measuring distance must be indoors; the target
surface for the measurement must be smooth and reflect
well.
– Measure the distance 10 times in succession.
The deviation of the individual measurements from the mean
value must not exceed ±2 mm (max.). Log the measure-
ments, so that you can compare their accuracy at a later point
of time.
Working with the Tripod (Accessory)
The use of a tripod is particularly necessary for larger distanc-
es. Position the measuring tool with the 1/4" thread 14 onto
the quick-change plate of the tripod 18 or a commercially
available camera tripod. Tighten the measuring tool with the
locking screw of the quick-change plate.
Set the corresponding reference level for measurement with
a tripod by pushing button 6 (the reference level is the
thread).
1 609 92A 1YM | (9.6.16)
Troubleshooting – Causes and Corrective
Measures
Cause
Temperature warning indicator (f) flashing; measure-
ment not possible
The measuring tool is outside the
operating temperature range from
– 10 °C to + 50 °C (in the continu-
ous measurement function up to
+40 °C).
"ERROR" indication in the display
Addition/Subtraction of measured
values with different units of
measure
The angle between the laser beam
and the target is too acute.
The target surface reflects too in-
tensely (e.g. a mirror) or insuffi-
ciently (e.g. black fabric), or the
ambient light is too bright.
The laser beam outlet 11 or the re-
ception lens 12 are misted up
(e.g. due to a rapid temperature
change).
Calculated value is greater than
2 3
999999 m/m /m .
Measuring result not plausible
The target surface does not reflect
correctly (e.g. water, glass).
The laser beam outlet 11 or the re-
ception lens 12 are covered.
Wrong reference level set
Obstruction in path of laser beam Laser point must be
The indication remains unchanged or the measuring tool
reacts unexpectedly after pressing a button
Software error
Corrective Measure
Wait until the measuring
tool has reached the op-
erating temperature
Only add/subtract
measured values with
the same units of
measure
Enlarge the angle be-
tween the laser beam
and the target
Work with the laser tar-
get plate 20 (accessory)
Wipe the laser beam out-
let 11 and/or the recep-
tion lens 12 dry using a
soft cloth
Divide calculation into
intermediate steps
Cover off the target sur-
face
Make sure that the laser
beam outlet 11 or the re-
ception lens 12 are un-
obstructed
Select reference level
that corresponds to
measurement
completely on target
surface.
Remove the batteries
and start the measuring
tool again after reinsert-
ing them.
Bosch Power Tools