Initial Operation; Measuring Procedure; Display Illumination; Measuring Functions - Bosch GLM 50 Original Instructions Manual

OBJ_BUCH-1444-005.book Page 14 Tuesday, April 1, 2014 10:46 AM
14 | English
inserting, pay attention to the correct polarity according to
the representation on the inside of the battery compartment.
When inserting the batteries/rechargeable batteries, pay at-
tention to the correct polarity according to the representation
on the inside of the battery compartment.
When the battery symbol appears for the first time on the
display, at least 100 individual measurements are still possi-
ble. The continuous measurement mode is deactivated.
When the battery symbol flashes, the batteries/recharge-
able batteries must be replaced. Measurements are no longer
possible.
Always replace all batteries/rechargeable batteries at the
same time. Do not use different brands or types of batter-
ies/rechargeable batteries together.
 Remove the batteries/rechargeable batteries from the
measuring tool when not using it for longer periods.
When storing for longer periods, the batteries/rechargea-
ble batteries can corrode and self-discharge.
Operation

Initial Operation

 Do not leave the switched-on measuring tool unattend-
ed and switch the measuring tool off after use. Other
persons could be blinded by the laser beam.
 Protect the measuring tool against moisture and direct
sun light.
 Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do
not leave it in vehicles for a long time. In case of large vari-
ations in temperature, allow the measuring tool to adjust to
the ambient temperature before putting it into operation.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
 Avoid heavy impact to or falling down of the measuring
tool. After severe exterior effects to the measuring tool, it
is recommended to carry out an accuracy check (see "Ac-
curacy Check of the Distance Measurement", page 16)
each time before continuing to work.
Switching On and Off
For switching on the measuring tool, the following possibili-
ties are given:
– Pressing the On/Off button 4: The measuring tool is
switched on and is in length measurement mode. The laser
is not activated.
– Pressing the measuring button 2: Measuring tool and laser
are switched on. The measuring tool is in length measure-
ment mode.
 Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To switch off the measuring tool, press the On/Off button 4
for a few seconds.
When no button on the measuring tool is pressed for approx.
5 minutes, the measuring tool automatically switches off to
save the batteries.
1 609 92A 0K9 | (1.4.14)

Measuring Procedure

After switching on by pressing the measuring button 2, the
measuring tool is always in length measurement mode. Other
measuring modes can be switched to by pressing the respec-
tive function/mode button (see "Measuring Functions",
page 14).
After switching on, the rear edge of the measuring tool is pre-
set as the reference level for the measurement. By pressing
the reference level button 6, the reference level can be
changed (see "Selecting the Reference Level (see figure A)",
page 14).
Place the measuring tool with the selected reference plane
against the desired starting point of the measurement (e.g. a
wall).
Briefly press the measuring button 2 to switch on the laser
beam.
 Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
Aim the laser beam at the target surface. Briefly press the
measuring button 2 again to initate the measurement.
In the continuous measurement mode, the measurement be-
gins immediately upon switching on the function.
Typically, the measured value appears after 0.5 seconds and
latest after 4 seconds. The duration of the measurement de-
pends on the distance, the light conditions and the reflection
properties of the target surface. The laser beam is switched
off automatically upon completion of the measurement.
When no measurement has taken place approx. 20 seconds
after sighting, the laser beam is switched off automatically to
save the batteries.
Selecting the Reference Level (see figure A)
For the measurement, you can select between three different
reference planes:
– The rear measuring-tool edge (e.g. when measuring on-
ward from a wall),
– The front measuring-tool edge (e.g. when measuring on-
ward from a table edge),
– The centre of thread 14 (e.g. for tripod measurements).
To select the reference level, press button 6 until the request-
ed reference level is indicated on the display. Each time after
switching on the measuring tool, the rear end of the measur-
ing tool is preset as the reference level.

Display Illumination

The display illumination is automatically activated, depending
on the ambient brightness. When no button is pressed after
the display illumination switches on, it is dimmed to save the
batteries.

Measuring Functions

Simple Length Measurement (see figure B)
For length measurements, press button 9 until the "length
measurement" indication appears on the display.
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