Bosch GLM 100 C Professional Original Instructions Manual page 17

OBJ_BUCH-2007-002.book Page 17 Friday, January 24, 2014 10:46 AM
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 31 (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.
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 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.
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 29 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).
Bosch Power Tools
Working with the Measuring Rail (see figures I–K)
The measuring rail 27 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 27 as shown and lock the measur-
ing tool with locking lever 28. 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.
When operating the measuring tool in the measuring rail 27,
data transmission is not possible.
To end the "Measuring rail" operating mode, switch the meas-
uring tool off and remove it from the measuring rail.
Troubleshooting – Causes and Corrective
Measures
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 meas-
ured values with different units
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 in-
sufficiently (e.g. black fabric),
or the ambient light is too bright.
The laser beam outlet 18 or the
reception lens 17 are misted up
(e.g. due to a rapid temperature
change).
Calculated value is greater than
1 999 999 or smaller than
2 3
–999 999 m/m /m .
English | 17
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 31 (accessory)
Wipe the laser beam outlet
18 and/or the reception
lens 17 dry using a soft
cloth
Divide calculation into in-
termediate steps
2 609 141 148 | (24.1.14)