Working Advice; Troubleshooting - Causes And Corrective Measures - Bosch GLM 50 Original Instructions Manual

OBJ_BUCH-1444-005.book Page 16 Tuesday, April 1, 2014 10:46 AM
16 | English
– For each calculation, the result of one measurement is
added (e.g. the volume value); for continuous measure-
ments, this would be the displayed measured value in re-
sult line b. The addition of individual measured values from
the measured-value lines a is not possible.
Subtracting Measured Values
To subtract measuring values, press mi-
nus button 5; For confirmation, "–" is in-
dicated on the display. The further proce-
dure is analog to "Adding Measured
Values".

Working Advice

General Information
The reception lens 12 and the laser beam outlet 11 must not
be covered when taking a measurement.
The measuring tool must not be moved while taking a meas-
urement (with the exception of the continuous measurement
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 pre-
cisely known (e.g. the width of a room or a door opening).
The measuring distance must be indoors; the target surface
for the measurement must be smooth and reflect well.
– Measure the distance 10 times after another.
1 609 92A 0K9 | (1.4.14)
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).
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 function
continuous measurement 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.
Corrective Measure
Wait until the measuring
tool has reached the
operating temperature
Only add/subtract
measured values with
the same units of
measure
Enlarge the angle
between the laser beam
and the target
Work with the laser
target plate 20 (acces-
sory)
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
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