Preparing For Measurement - Bosch GTC600C Operating/Safety Instructions Manual

To switch off the tool, press the On/Off But-
ton 12 again. The measuring tool saves all
settings and then switches itself off. Close
the Protective Cap 1 to transport the mea-
suring tool safely.
In the "Settings" menu, you can choose
whether and after how much time the mea-
suring tool automatically switches off. (See
"<Shutdown Time>" under "<Tool>" on page
19.)
If the battery or the measuring tool is not
within the operating temperature range stat-
ed in the specifications, the measuring tool
will shut down automatically after a brief
warning. (See "Troubleshooting" on page
23.) Allow the measuring tool to reach to
the correct temperature and then switch it
back on.
To save energy, only switch the measuring
tool on when you are using it.

Preparing for Measurement

Setting the Emissivity Degree
for Surface-temperature
Measurements
The emissivity degree of an object depends
on the material and the structure of its sur-
face. This specifies how much infrared ther-
mal radiation the object emits compared
with an ideal radiant warmer (black body,
emissivity ε = 1) and accordingly has a value
between 0 and 1.
To determine the surface temperature, the
tool performs a contactless measurement of
the natural infrared thermal radiation emit-
ted by the object at which the tool is aimed.
To ensure correct measurement, the emis-
sivity setting on the measuring tool must
be checked before every measurement and
adapted to the measuring object if neces-
sary.
You can select one of the preset emissiv-
ity levels or enter an exact numerical value.
Adjust the required emissivity using the
"Measurement" -> "Emissivity" menu. (See
"<Emissivity>" under "<Measurement>" on
page 18.)
The lower the emissivity, the greater the ef-
fect of the reflected temperature on the mea-
suring result. Always adjust the reflected
temperature when changing the emissivity.
Set the reflected temperature via the <Mea-
Operation
surement> -> <Reflected Temp.> menu. (See
"Main Menu", page 18.)
Temperature differences allegedly shown by
the measuring tool may be caused by differ-
ent temperatures and/or different emissivity
levels. If the emissivity levels are very dif-
ferent, the depicted temperature differences
may differ considerably from the actual tem-
perature differences.
rect if the emissivity setting and the emis-
sivity of the object match.
Differences in color may be caused by differ-
ent temperatures and/or different emissivity
levels. If the emissivity levels are very dif-
ferent, the depicted temperature differences
may differ considerably from the actual tem-
perature differences.
If there are multiple objects made of dif-
ferent materials or that have different
structures in the measurement range, the
displayed temperature values are only con-
clusive for the objects that match the emis-
sivity setting.
For all other objects (with different emissiv-
ity levels), the displayed color differences
can be used as an indication of temperature
relationships.
Material
Concrete
Plaster/mortar
Roofing tiles
Roofing felt
Radiator paint
Wood
Linoleum
Paper
Notes on the Measuring Conditions
Highly reflective or shiny surfaces (e.g. shiny
tiles or polished metals) may distort or im-
pair the results shown. If necessary, mask
the surface to be measured with a dark,
matt adhesive tape that conducts heat well.
Allow the tape to acclimatize briefly on the
surface.
-15-
Temperature measure-
ments will only be cor-
Emissivity
32ºF to 212ºF
(0ºC to 100ºC)
0.93
0.93
0.93
0.93
0.93
0.91
0.88
0.89