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1 609 92A 0KT | (23.4.14) Bosch Power Tools
Sighting with the Optical Sight (GLM 250 VF)
(see figure N)
The sighting line through the optical sight and the laser beam
run parallel to each other. This allows for precise sighting over
long distances, when the laser dot is no longer visible with the
naked eye.
For sighting, view through the viewfinder of the optical sight
10. Take care that the optical sight window 25 is not obstruct-
ed and clean.
Note: For close vicinities, the actual and the displayed target
point are not identical.
Sighting with the Alingment Aid (see figure O)
The alignment aid 24 supports sighting over larger distances.
For this, view alongside the alignment aid on the side of the
measuring tool. The laser beam runs parallel to this sighting
line.
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 21 onto
the quick-change plate of the tripod 30 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 8 (the reference level is the
thread).
Troubleshooting Causes and Corrective
Measures
The measuring tool monitors the correct
function for each measurement. When a de-
fect is determined, only the symbol shown
aside flashes in the display. In this case, or
when the above mentioned corrective
measures cannot correct an error, have the measuring tool
checked by an after-sales service agent for Bosch power
tools.
Accuracy Check of 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 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 after another.
The deviation of the individual measurements from the mean
value must not exceed ±1.5 mm (max.). Log the measure-
ments, so that you can compare their accuracy at a later point
of time.
Maintenance and Service
Maintenance and Cleaning
Store and transport the measuring tool only in the supplied
protective pouch.
Keep the measuring tool clean at all times.
Do not immerse the measuring tool in water or other fluids.
Cause Corrective Measure
Temperature warning indicator (i) 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).
Wait until the measuring
tool has reached the
operating temperature
Battery low indicator (f) appears
Battery voltage decreasing
(measurement still possible)
Replace batteries/
rechargeable batteries
Battery low indicator (f) flashing; measurement not
possible
Battery voltage too low Replace batteries/
rechargeable batteries
The indicationsERROR and––––– are indicated in
the display
The angle between the laser beam
and the target is too acute.
Enlarge the angle
between the laser beam
and the target
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.
Work with the laser tar-
get plate 32 (accessory)
The laser beam outlet 27 or the
reception lens 26 are misted up
(e.g. due to a rapid temperature
change).
Wipe the laser beam out-
let 27 and/or the recep-
tion lens 26 dry using a
soft cloth
Calculated value is greater than
999999 m/m
2
/m
3
.
Divide calculation into
intermediate steps
The indication “ERROR” flashes at the top in the display
Addition/Subtraction of measured
values with different units of mea-
sure
Only add/subtract
measured values with
the same units of mea-
sure
Measuring result not plausible
The target surface does not reflect
correctly (e.g. water, glass).
Cover off the target
surface
The laser beam outlet 27 or the re-
ception lens 26 are covered.
Make sure that the laser
beam outlet 27 or the re-
ception lens 26 are un-
obstructed
Obstruction in path of laser beam Laser point must be
completely on target
surface.
Wrong reference level set Select reference level
that corresponds to
measurement
Cause Corrective Measure
OBJ_BUCH-947-005.book Page 24 Wednesday, April 23, 2014 9:23 AM
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