Working Advice; Troubleshooting - Causes And Corrective Meas- Ures - Bosch Professional GLM 80 Original Instructions Manual

OBJ_BUCH-1347-005.book Page 25 Wednesday, August 7, 2013 4:12 PM

Working Advice

General Information
The reception lens 17 and the laser beam outlet 16 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
and grade measurement functions). 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 27 (ac-
cessory) and the laser target plate 28 (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 28 (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 (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 case of greater deviation, the measuring tool must be recal-
ibrated. For this, press and hold the grade measurement but-
ton 3. Follow the directions on the display.
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 after another.
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.
Bosch Power Tools
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 19 onto
the quick-change plate of the tripod 26 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 10 (the reference level is the
thread).
Working with the Measuring Rail (see figures I–K)
The measuring rail 24 can be used for a more accurate grade
measurement result. Distance measurements are not possi-
ble with the measuring rail.
Place the measuring tool into the measur-
ing rail 24 as shown and lock the measur-
ing tool with locking lever 25. Press the
measuring button 2 to activate the "Meas-
uring rail" operating mode.
Regularly check the accuracy of the grade
measurement by carrying out a reversal
measurement or with the spirit levels of the measuring rail.
In case of greater deviation, the measuring tool must be recal-
ibrated. For this, press and hold the grade measurement but-
ton 3. Follow the directions on the display.
To end the "Measuring rail" operating mode, switch the meas-
uring tool off and remove it from the measuring rail.
Troubleshooting – Causes and Corrective Meas-
ures
Cause
Temperature warning indicator (k) 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 meas-
ure
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 16 or the re-
ception lens 17 are misted up
(e.g. due to a rapid temperature
change).
Calculated value is greater than
2 3
999999 m/m /m .
English | 25
Corrective Measure
Wait until the measuring
tool has reached the op-
erating temperature
Only add/subtract
measured values with
the same units of meas-
ure
Enlarge the angle be-
tween the laser beam
and the target
Work with the laser tar-
get plate 28 (accessory)
Wipe the laser beam out-
let 16 and/or the recep-
tion lens 17 dry using a
soft cloth
Divide calculation into
intermediate steps
2 609 141 088 | (7.8.13)