Measuring Functions - Bosch GTC 400 C Professional Manual Original

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.
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
Bosch Power Tools
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
exact emissivity of the object you want to measure,
you can also set it as a numerical value in the
<Emissivity> menu item.
▪ <Reflected temp.> (b)
Setting this parameter can improve the accuracy of the
measuring result, especially with low-emissivity
(= high-reflection) materials. In some situations (espe-
cially in indoor areas) the reflected temperature cor-
responds to the ambient temperature. If there are ob-
jects with greatly deviating temperatures close to
highly reflective objects, this value should be adjusted
as the measurement may be affected.
– <Display>
▪ <Centerspot> (k)
The point is displayed in the centre of the thermal im-
age and shows you the measured temperature value at
this point.
▪ <Hotspot> (j): <ON>/<OFF>
The hottest point (= measuring pixel) is indicated by
red crosshairs in the thermal image. This facilitates the
search for critical areas (e.g. a loose contact terminal
in the control cabinet).
▪ <Coldspot> (l): <ON>/<OFF>
The coldest point (= measuring pixel) is indicated by
blue crosshairs in the thermal image. This facilitates
the search for critical areas (e.g. a leak in a window).
▪ <Color scale> (g): <ON>/<OFF>
– <WiFi> (d): <ON>/<OFF>
(see "Data Transfer", page 22)
– <Tool>
▪ <Language>
Under this menu item, you can select the language
used in the display.
▪ <Time & Date> (a)
To change the time and date shown in the measuring
tool, call up the <Time & Date> submenu. This sub-
menu not only allows you to set the time and date but
also to change their respective formats. To exit the
<Time> and <Date> submenu, press either the right-
hand function button (7) to save the settings, or the
left-hand function button (13) to discard the changes.
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