Checking Accuracy And Calibrating The Target Indicator (Crosshairs); Working With The Tripod (Accessory); Errors - Causes And Corrective Measures - Bosch GLM 120 C Professional Manual Original

32 | English
Checking accuracy and calibrating the target
indicator (crosshairs)
Check the accuracy of the alignment of the laser and target
indicator on a regular basis.
– Select a bright area at least five metres away with as little
illumination as possible (e.g. a white wall) as the target.
– Check whether the laser point is inside the target indic-
ator in the display.
If the laser point is not inside the target indicator, you must
recalibrate the target indicator.
To do so, select in the settings. Follow the directions on
the display.

Working with the tripod (accessory)

The use of a tripod is particularly necessary for larger dis-
tances. Place the measuring tool with the 1/4" thread (17)
on the quick-release plate of the tripod (27) or a conven-
tional camera tripod. Tighten it using the locking screw of the
quick-release plate.
Set the reference level for measurements with a tripod in the
settings (tripod reference level).
Errors – Causes and Corrective
Measures
Cause Corrective measures
Temperature warning flashes, measurement not pos-
sible
The measuring tool is outside Wait until the measuring tool
the operating temperature of has reached operating tem-
–10 °C to +45 °C (in the con- perature.
tinuous measurement func-
tion, up to +40 °C).
Display shows "ERROR"
Addition/subtraction of Only add/subtract measured
measured values with vari- values with the same units of
ous units of measurement. measurement.
Angle between laser beam Increase the angle between
and target is too acute. the laser beam and the tar-
get.
Target surface is too reflect- Use the laser target plate
ive (e.g. mirror) or not re- (25).
flective enough (e.g. black
material), or ambient light is
too bright.
The laser beam output (18), Wipe the laser beam output
(18), reception lens (20) or
reception lens (20) or cam-
era (19) are fogged up (e.g. camera (19) dry with a soft
cloth.
due to a rapid temperature
change).
Calculated value is larger Divide the calculation into in-
than +1,999,999 or smaller termediate steps.
2 3
than -999,999 m /m .
1 609 92A 4F4 | (22.10.2018)
Cause Corrective measures
Display shows "CAL" and "ERROR"
The calibration of the grade Repeat the calibration ac-
measurement has not been cording to the instructions
carried out in the right order that appear on the display
or has not been carried out in and in the manual.
the correct positions.
The surfaces used for calib- Repeat the calibration on a
ration were not precisely ho- horizontal or vertical surface
rizontal or vertical. and check the surfaces be-
forehand if necessary using a
spirit level.
The measuring tool has Repeat the calibration and
moved or tilted when the hold the measuring tool still
button was pressed. against the surface when
pressing the button.
Battery charge indicator (g), temperature warning and
"ERROR" shown in the display
The temperature of the Wait until the charging tem-
measuring tool is outside the perature range has been
permissible charging temper- reached.
ature range.
Battery charge indicator (g) and "ERROR" shown in the
display
The battery charging voltage Check whether the connec-
is not correct. tion has been established
correctly and that the char-
ger is working properly. If the
device symbol flashes, the
battery is defective and must
be replaced by the Bosch
after-sales service.
Measurement result implausible
Target surface reflection not Cover the target surface.
distinct (e.g. water, glass).
The laser beam output (18), Keep the laser beam output
reception lens (20) or cam- (18), reception lens (20)
and camera (19) clear.
era (19) is covered.
An incorrect reference level Select a reference level that
has been set. is appropriate for the meas-
urement.
Obstruction in the path of the The laser point must be fully
laser beam. on the target surface.
Bluetooth® cannot be activated
The battery is too weak. Charge the battery of the
measuring tool.
No Bluetooth® connection
There is a problem with the Switch Bluetooth® off and
Bluetooth® connection. back on again on the measur-
ing tool and mobile device.
Check the application on
your mobile device.
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