User manual

18 | English
1 609 929 T68 | (13.10.09) 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 obstructed and clean.
Note: For close vicinities, the actual and the dis-
played 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 distances. 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 meas-
urement with a tripod by pushing button 8 (the
reference level is the thread).
Troubleshooting – Causes and
Corrective Measures
Cause Corrective
Measure
Temperature warning indicator (i) flashing;
measurement not possible
The measuring tool is out-
side the operating temper-
ature 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 temper-
ature
Battery low indicator (f) appears
Battery voltage decreas-
ing (measurement still
possible)
Replace batteries/
rechargeable bat-
teries
Battery low indicator (f) flashing; measure-
ment not possible
Battery voltage too low Replace batteries/
rechargeable bat-
teries
The indications “ERROR” and “–––––” are
indicated in the display
The angle between the
laser beam and the target
is too acute.
Enlargen the angle
between the laser
beam and the tar-
get
The target surface reflects
too intensely (e.g. a mir-
ror) or insufficiently (e.g.
black fabric), or the ambi-
ent light is too bright.
Work with the
laser target 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 outlet 27
and/or the recep-
tion lens 26 dry
using a soft cloth
Calculated value is great-
er than 999999 m/m
2
/m
3
/
ft/ft
2
/ft
3
/yd.
Divide calculation
into intermediate
steps
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