Measuring Procedure; Selecting The Reference Level (See Figure A) - Berner BLM 80 Manual Original

 Protect the measuring tool against moisture
and direct sun light.
 Do not subject the measuring tool to extreme
temperatures or variations in temperature. As
an example, do not leave it in vehicles for long
time. In case of large variations 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
temperature, 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 "Accuracy Check
and Calibration of the Grade Measurement" and
"Accuracy Check of the Distance Measurement"
on page 24) each time before continuing to
work).
Switching On and Off
For switching on the measuring tool, the following
possibilities are given:
– Pressing the On/Off button 8: 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 measurement mode. When the measur-
ing tool is inserted in the measuring rail 24, the
grade measurement function is activated.
 Do not point the laser beam at persons or ani-
mals and do not look into the laser beam your-
self, not even from a large distance.
To switch off the measuring tool, press the On/Off
button 8 for a few seconds.
When no button on the measuring tool is pressed
for approx. 5 minutes, the measuring tool automat-
ically switches off to save the batteries.
When the angle is not changed for approx.
5 minutes when in the "Grade measurement" oper-
ating mode, the measuring tool automatically
switches off to save the batteries.
When switching off automatically, all stored values
are retained.

Measuring Procedure

When the measuring tool is inserted in the measur-
ing rail 24, it is always in the length measurement
or grade measurement function after switching on
by pressing the measuring button 2. Other measur-
ing modes can be switched to by pressing the re-
spective function/mode button (see "Measuring
Functions", page 21).
20 | English
After switching on, the rear edge of the measuring
tool is preset as the reference level for the meas-
urement. By pressing the reference level button 10,
the reference level can be changed (see "Selecting
the Reference Level", page 20).
Place the measuring tool with the selected refer-
ence 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 ani-
mals and do not look into the laser beam your-
self, 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.
When the laser beam is switched on permanently,
the measurement already starts after the first actu-
ation of the measuring button 2. In continuous
measurement mode, the measurement starts im-
mediately upon switching on.
Typically, the measured value appears after 0.5
and latest after 4 seconds. The duration of the
measurement depends on the distance, the light
conditions and the reflection properties of the tar-
get surface. The end of the measurement is indicat-
ed by a signal tone. The laser beam is switched off
automatically upon completion of the measure-
ment.
When no measurement takes place approx.
20 seconds after collimating, the measuring tool
automatically switches off to save the battery.
Selecting the Reference Level
(see figure A)
For the measurement, you can select between four
reference planes:
– The rear edge of the measuring tool or the front
edge of the 90 ° folded-out positioning pin 9 (e.g.
when measuring onward from outer corners),
– The tip of the 180 ° folded-out positioning pin 9
(e.g. when measuring from a corner),
– The front measuring-tool edge (e.g. when meas-
uring onward from a table edge),
– The centre of thread 19 (e.g. for tripod measure-
ments).
To select the reference level, press button 10 until
the requested reference level is indicated on the
display. Each time after switching on the measur-
ing tool, the rear end of the measuring tool is pre-
set as the reference level.
Subsequent changing of the reference level for
measurements that have already been carried out
(e.g. when indicating measuring values in the
measured-value list) is not possible.
2 609 141 098 • 19.7.13