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OBJ_BUCH-3181-006.book Page 31 Thursday, April 12, 2018 9:20 AM
The measuring tool must not be moved while taking a meas-
urement. 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 visi-
bility of the laser beam in strong extraneous light, use the in-
tegrated camera 19, the laser viewing glasses 26 (accessory)
and the laser target plate 25 (accessory) or shade the target
area.
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 25 (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 and Calibration of the Grade Measure-
ment (Tilt Calibration) (see figure H)
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 difference 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. To do so, select
the instructions on the display.
After severe temperature changes and impact, we recom-
mend 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.
Accuracy Check of the Distance Measurement
The accuracy of the measuring tool can be checked as follows:
– Select a permanently unchangeable measuring section
which is approx. 3 to 10 m long and which you know the ex-
act length of (e.g. room width, door opening). The meas-
urement should be performed under favourable condi-
tions, i.e. the measuring section should be indoors with
weak backlighting and the target area of the measurement
should be smooth and reflect well (e.g. a white-painted
wall).
– Measure the distance 10 times in succession.
The deviation of the individual measurements from the aver-
age value must not exceed ±2 mm over the entire measuring
section in favourable conditions. Record the measurements
in order to be able to compare the accuracy at a later date.
Bosch Power Tools
Checking Accuracy and Calibrating the Target Indicator
(Viewfinder Calibration) (Crosshairs)
Check the accuracy of the alignment of the laser and target in-
dicator on a regular basis.
– Select a bright area at least 5m away with as little illumina-
– Check whether the laser point is inside the target indicator
If the laser point is not inside the target indicator, you must re-
calibrate the target indicator.
To do so, select
the display.
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 17 onto
the quick-change plate of the tripod 27 or a commercially
available camera tripod. Tighten the measuring tool with the
locking screw of the quick-change plate.
Set the reference level for measurements with a tripod in the
settings (tripod reference level).
Troubleshooting – Causes and Corrective
Measures
Cause
Temperature warning flashes, measurement not
possible
The measuring tool is outside
the operating temperature of
–10 °C to +45 °C (in the contin-
uous measurement function, up
to +40 °C).
"ERROR" indication in the display
Addition/Subtraction of mea-
in the settings. Follow
sured values with different units
CAL
of measure
The angle between the laser
beam and the target is too acute.
The target surface reflects too
intensely (e.g. a mirror) or insuf-
ficiently (e.g. black fabric), or
the ambient light is too bright.
The laser beam output 18, re-
ception lens 20 or camera 19
are fogged up (e.g. due to a rapid
temperature change).
Calculated value is greater than
1 999 999 or smaller than
–999 999 m/m
tion as possible (e.g. a white wall) as the target.
in the display.
in the settings. Follow the instructions on
CAL
Corrective Measure
Wait until the measuring
tool has reached the oper-
ating temperature
Only add/subtract meas-
ured values with the same
units of measure
Enlarge the angle between
the laser beam and the tar-
get
Work with the laser target
plate 25 (accessory)
Wipe the laser beam out-
put 18, reception lens 20
and camera 19 dry with a
soft cloth
Divide calculation into in-
termediate steps
2
3
/m
.
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