Bosch GTC 400 C Professional Manual Original página 20

20 | English
jects that match the emissivity setting. For all other objects
(with different emissivity levels), the displayed colour differ-
ences can be used as an indication of temperature relation-
ships.
Information about the Measuring Conditions
Highly reflective or shiny surfaces (e.g. shiny tiles or pol-
ished metals) may significantly distort or impair the results
shown. If necessary, mask the measuring surface with a
dark, matt adhesive tape that conducts heat well. Allow the
tape to briefly reach the correct temperature on the surface.
Make sure that a favourable measuring angle is used on re-
flective surfaces in order to ensure that the thermal radiation
reflected by other objects does not distort the result. For ex-
ample, the reflection of your own emitted body heat may in-
terfere with the measurement when measuring head-on from
a perpendicular position. On a level surface, the outline and
temperature of your body could therefore be displayed (re-
flected value), and these values do not correspond to the ac-
tual temperature of the measured surface (emitted value or
real value of the surface).
Measuring through transparent materials (e.g. glass or trans-
parent plastics) is fundamentally not possible.
Consequently, the more suitable and stable the measuring
conditions are, the more accurate and reliable the measure-
ment readings are. Not only do significant fluctuations in the
temperature of the environmental conditions have an im-
pact, the accuracy can also be impaired by significant fluctu-
ations in the temperatures of the object being measured.
Infrared temperature measurement is impaired by smoke,
steam/high humidity or dusty air.
Information for achieving improved measurement accuracy:
– Move as close as possible to the object to be measured to
minimise interfering factors between you and the surface
to be measured.
– Ventilate indoor areas prior to measurement, especially
when the air is contaminated or extremely steamy. Once
ventilated, allow the room to reacclimatise a while until it
returns to the usual temperature.
Assigning Temperatures on the Basis of the Scale
A scale (g) is shown on the right-hand side of the
display. The values at the top and bottom end are
oriented to the maximum (f) and minimum (h)
temperature recorded in the thermal image. For
the scale, 99.8 % of the total pixels are evalu-
ated. Colours are assigned to temperature values
with a uniform distribution in the image (lin-
early).
Different shades can therefore be used to assign
temperatures within these two limit values. For
example, a temperature that is exactly between
the maximum and minimum value is assigned to
the centre colour range of the scale.
To determine the temperature of a specific area, move the
measuring tool so that the crosshairs with temperature
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display (k) are aimed at the required point or area. In the
automatic setting, the colour spectrum of the scale is always
distributed linearly (= uniformly) across the entire measur-
ing range between the maximum and minimum temperat-
ures.
The measuring tool displays all measured temperatures in
the measuring range in relation to one another. If heat is dis-
played as blue in the colour palette in an area, for example in
a colour representation, this means that the blue areas are
among the colder measured values in the current measuring
range. However, these areas may still be in a temperature
range which could cause injuries in certain circumstances.
You should therefore always note the temperatures dis-
played on the scale or at the crosshairs themselves.
Functions
Adjusting the Colour Display
Depending on the measurement conditions, different colour
palettes may make it easier to analyse the thermal image and
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
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