Bosch Professional GTC 400 C Original Instructions Manual page 11

display objects or circumstances more clearly in the display.
This does not affect the measured temperatures. The only
change is the way in which the temperature values are dis-
played.
To change the colour palette, remain in measuring mode and
press the right-hand (8) or left-hand (12) arrow button.
Superimposition of Thermal Image and Real
Image
For improved orientation (= local assignment of the thermal
image displayed), with matched temperature ranges, a real
visual image can additionally be inserted.
Note: The superimposition of the real image and thermal im-
age corresponds exactly at a distance of 0.55 m. If the tool is
closer to or further away from the object being measured,
this fundamentally results in misalignment of the real image
and thermal image. This misalignment can be compensated
for with the GTC Transfer Software.
The measuring tool camera offers you the following options:
– Complete infrared image
Only the thermal image is displayed.
– Picture-in-picture
The thermal image displayed is cropped and the sur-
rounding area is shown as a real image. This setting im-
proves the local assignment of the measuring range.
– Transparency
The thermal image displayed is placed on top of the real
image in such a way that it is transparent. This enables
improved detection of objects.
You can select the setting by pressing the up (5) or
down (10) arrow buttons.
Fixing the Scale
The colour distribution in the thermal image is adjusted auto-
matically but can be fixed by pressing the right-hand func-
tion button (7). This enables a comparison to be made
between thermal images taken under different temperature
conditions (e.g. when checking several rooms for thermal
bridges). It also allows an extremely cold or hot object to be
hidden in the thermal image. This object would otherwise
distort the image (e.g. a radiator as a hot object when
searching for thermal bridges).
To switch the scale back to automatic, press the right-hand
function button (7) again. The temperatures are now dy-
namic again and adapt to the measured minimum and max-
imum values.
Measuring Functions
To call up further functions that may be helpful for the dis-
play, press the Func (6) button. Use the left-hand arrow
button (12) or the right-hand arrow button (8) to navigate
through the displayed options to select a function. Select a
function and press the Func (6) button again.
Bosch Power Tools
The following measuring functions are available:
– <Automatic>
Colours are distributed automatically in the thermal im-
age.
– <Heat detector>
Only the warmer temperatures in the measuring range are
displayed as a thermal image in this measuring function.
The area outside these warmer temperatures is shown as
a real image in grey scale. The depiction in grey scale pre-
vents coloured objects from being wrongly associated
with temperatures (e.g. a red cable in the control cabinet
when searching for overheated components). Adjust the
scale using the up arrow button (5) and down arrow
button (10). This expands or reduces the temperature
range, thereby expanding or reducing the thermal image.
The measuring tool continues to measure minimum and
maximum temperatures and displays these at the ends of
the scale (g).
– <Cold detector>
Only the colder temperatures in the measuring range are
displayed as a thermal image in this measuring function.
The area outside these colder temperatures is shown as a
real image in grey scale to prevent coloured objects from
being wrongly associated with temperatures (e.g. a blue
window frame when searching for faulty insulation). Ad-
just the scale using the up arrow button (5) and down ar-
row button (10). This expands or reduces the temperat-
ure range, thereby expanding or reducing the thermal im-
age. The measuring tool continues to measure minimum
and maximum temperatures and displays these at the
ends of the scale (g).
– <Manual>
If greatly deviating temperatures are measured in the
thermal image (e.g. a radiator as a hot object when
searching for thermal bridges), the available colours are
distributed among a large number of temperature values
in the range between the maximum and the minimum
temperature. This can result in a situation where subtle
temperature differences can no longer be shown in detail.
To obtain a detailed depiction of the temperature range to
be examined, take the following steps: After switching
to <Manual> mode, you can set the maximum and the
minimum temperature. Doing this enables you to set the
temperature range that is relevant to you and in which
you would like to detect subtle differences. The <Reset
scale> setting automatically readjusts the scale to the
measured values in the infrared sensor's field of view.
Main Menu
To access the main menu, first press the Func (6) button to
call up the measuring functions. Now press the right-hand
function button (7).
– <Measurement>
▪ <Emissivity> (c)
A selection of saved emissivities is available for some
of the most common materials. Select the relevant ma-
terial in the <Material> menu item. The corresponding
emissivity is shown in the line beneath. If you know the
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