Bosch GLM Professional 80 Original Instructions Manual page 15

OBJ_BUCH-3509-001.book Page 15 Thursday, June 28, 2018 9:49 AM
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 in succession.
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 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 "Mea-
suring 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 mea-
suring tool off and remove it from the measuring rail.
Troubleshooting – Causes and Corrective
Measures
Cause
Temperature warning indicator (j) flashing; measure-
ment not possible
The measuring tool is outside the
operating temperature range from
– 10 °C to + 50 °C (in the continu-
ous measurement function up to
+40 °C).
Bosch Power Tools
Cause
"ERROR" indication in the display
Addition/Subtraction of measured
values with different units of mea-
sure
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
999999 m/m
Indication ">60°" or "<–60°" on the display
The inclination measuring range
for the measuring mode and/or the
reference plane has been exceed-
ed.
"CAL" and "ERROR" indication in the display
The calibration of the grade mea-
surement was not carried out in
the correct sequence or in the cor-
rect positions.
The surfaces used for the calibra-
tion were not accurately aligned
(horizontal or vertical).
The measuring tool was moved or
tilted while pressing the button.
Battery charge-control indicator (g), temperature warn-
ing (j) and "ERROR" indication in the display
Temperature of the measuring tool
not within the allowable charge-
temperature range
Corrective Measure
Wait until the measuring
tool has reached the op-
erating temperature
English | 15
Corrective Measure
Only add/subtract
measured values with
the same units of mea-
sure
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
2 3
/m . intermediate steps
Carry out the measure-
ment within the speci-
fied angle range.
Repeat the calibration
according to the instruc-
tions on the display and
in the operating instruc-
tions.
Repeat the calibration
on a horizontal or verti-
cal surface; if required,
check the surface first
with a level.
Repeat the calibration
and hold the measuring
tool in place while press-
ing the button.
Wait until the charge-
temperature range is
reached.
1 609 92A 4GN | (28.6.18)