Bosch GIS 1000 C Professional Notice Originale page 23

appear on the display (18). After the start sequence, the
measuring tool will be in the operating mode that was saved
the last time the tool was switched off. The lasers are not yet
switched on.
Only upon the initial starting operation does the <Tool>
menu also appear after the start sequence. In this menu, you
can determine the settings of the measuring tool, such as the
language of all displays (see "<Tool> submenu", page 27).
Confirm the selected settings by pressing the right-hand
function button (10). You can also change any of the set-
tings later in the <Tool> submenu.
Never leave the measuring tool unattended when
u
switched on, and ensure the measuring tool is
switched off after use. Others may be dazzled by the
laser beam.
Do not direct the laser beam at persons or animals and
u
do not stare into the laser beam yourself (even from a
distance).
In the factory setting, the brightness of the display lighting is
reduced 30 s after each button press to save energy. Press-
ing any button will switch the display lighting back to full
strength. In the <Light Duration> menu, you can change
this lighting time (see "<Light Duration>", page 27).
To switch off the measuring tool, press the on/off
button (12). The measuring tool saves the current operating
mode and the settings and then switches off. Put the pro-
tective cap (21) back on the reception lens (23) and put the
protective cap (19) on the humidity and ambient temperat-
ure sensor (5).
Do not switch off the measuring tool by removing the battery
pack or battery adapter because this may damage the in-
ternal memory in certain cases.
In the main menu, you can set whether and after how long
without button press/measurement the measuring tool auto-
matically switches off (see "<Shutdown Time>", page 27).
The current operating mode and the settings are also saved
when the tool switches off automatically.
If the rechargeable battery or the measuring tool are outside
the operating temperature specified in the Technical Data,
the measuring tool will be switched off automatically after a
short warning (see "Errors – causes and corrective meas-
ures", page 28). Allow the measuring tool to reach the cor-
rect temperature and then switch it back on.
Measurement preparations
Setting the emissivity for surface temperature
measurements
To determine the surface temperature, the tool performs a
contactless measurement of the natural infrared thermal ra-
diation emitted by the object at which the tool is aimed. To
ensure correct measurement, the emissivity setting on the
measuring tool must be checked before every measure-
ment and adapted to the measuring object if necessary.
The preset emissivities in the measuring tool are reference
values.
You can select one of the preset emissivity levels or enter an
exact numerical value. Set the required emissivity via the
Bosch Power Tools
<Measurement> → <Emissivity Degree> menu (see
"<Main Menu>", page 27).
Correct temperature measurements are only possible
u
if the set emissivity and emissivity of the object
agree, and the correct reflected temperature is set.
Otherwise, object temperatures could be shown to be
hotter or colder than they are, which may present a
danger if touched.
The lower the emissivity, the greater the effect of the reflec-
ted temperature on the measuring result. Always adjust the
reflected temperature when changing the emissivity. Set the
reflected temperature via the
<Measurement> → <Reflected Temp.> menu (see "<Main
Menu>", page 27).
If there are several objects with a different emissivity being
measured within the measured area identified by the laser,
the temperature measurement can be distorted.
Measured area for surface temperature measurements
The laser points generated by the measuring tool border the
exterior circular measured area. The displayed measured
temperature value shows the average surface temperature
within this area.
Do not direct the laser beam at persons or animals and
u
do not stare into the laser beam yourself (even from a
distance).
Increasing the distance between the measuring tool and the
object you are measuring will increase the distance between
the laser points and consequently the size of the area meas-
ured.
If the laser points are difficult to recognise, you can switch
on the <Measuring Frame> (b) on the display (see
"<Measuring Frame>", page 27). The measuring frame
can be used to indicate the area being measured and helps
to improve orientation. The measuring frame may vary from
the area being measured depending on the measuring dis-
tance. The area located between the laser points is decisive
for the measurement.
Information about the measuring conditions
Highly reflective, shiny or transparent surfaces (e.g. high-
gloss tiles, stainless steel cupboard fronts or saucepans)
may impair the surface temperature reading. If necessary,
mask the area to be measured with a dark, matt adhesive
tape that conducts heat well. Allow the tape to acclimatise
briefly on the surface.
It is not technically possible to perform measurements
through transparent materials.
Consequently, the more suitable and stable the measuring
conditions are, the more accurate and reliable the results of
the measurement will be.
The humidity and ambient temperature sensor (5) can be
damaged by chemical contaminants, such as paint or varnish
vapours. Infrared temperature measurement is impaired by
smoke, vapour or dusty air.
It is therefore important to ventilate the room prior to meas-
uring, especially when the air is contaminated or steamy. For
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