Measuring Functions - Bosch GTC 400 C Professional Manual Original

OBJ_BUCH-3136-002.book Page 21 Tuesday, August 22, 2017 6:26 PM
Functions
Adjusting the colour display
Depending on the measurement conditions, different colour
palettes can make it easier to analyse the thermal image and
show objects or circumstances more clearly in the display.
This does not affect the measured temperatures. Only the
way in which the temperature values are shown changes.
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 visual
real image can additionally be inserted.
Note: The superimposition of the real image and thermal im-
age is accurate at a distance of 0.55 m. If the tool is closer to
or further away from the object being measured, this may re-
sult in misalignment of the real image and thermal image.
The thermal imaging camera offers you the following options:
– Complete infrared image
Only the thermal image is displayed.
– Image in image
The thermal image displayed is cropped and the surround-
ing area is shown as a real image. This setting improves the
local assignment of the measurement range.
– Transparency
The thermal image displayed is placed on top of the real im-
age in such a way that it is slightly transparent. This ena-
bles improved detection of objects.
You can adjust 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 function
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).
To switch the scale back to automatic, press the right-hand
function button 7 again. The temperatures are now dynamic
again and adapt to the measured minimum and maximum
values.

Measuring functions

To call up further functions which may be helpful for the dis-
play, press the "Func" button 6. Use the right-hand/left-hand
buttons to navigate through the displayed options to select a
function. Select a function and press the "Func" button 6
again.
The following measuring functions are available:
– "Automatic"
Colours are distributed automatically in the thermal image
– "Heat detector"
Only the warmer temperatures in the measurement range
are displayed as a thermal image in this measuring func-
tion. The area outside these warmer temperatures is dis-
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played in greyscale as a real image so that coloured objects
are not wrongly associated with temperatures (e.g. red ca-
ble in the control cabinet when looking for overheated
components). Adjust the scale using the up 5 and down 10
buttons. This expands or reduces the temperature range
shown.
The tool continues to measure minimum and maximum
temperatures and displays these at the ends of the scale.
You can, however, control which temperature range is
shown in colour as a thermal image.
– "Cold detector"
Only the colder temperatures in the measurement range
are displayed as a thermal image in this measuring func-
tion. The area outside these colder temperatures is dis-
played in greyscale as a real image so that coloured objects
are not wrongly associated with temperatures (e.g. blue
window frame when looking for faulty insulation). Adjust
the scale using the up 5 and down 10 buttons. This ex-
pands or reduces the temperature range shown.
The tool continues to measure minimum and maximum
temperatures and displays these at the ends of the scale.
You can, however, control which temperature range is
shown in colour as a thermal image.
– "Manual"
If greatly deviating temperatures are measured in the ther-
mal image (e.g. 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 differenc-
es can no longer be shown in detail. To obtain a detailed de-
piction of the focus temperature, switch to "Manual" mode
and 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 differenc-
es. The Reset setting automatically readjusts the scale to
the measured values in the infrared sensor's field of view.
Main Menu
To access the main menu, press the "Func" button 6 to call up
the measuring functions. Now press the right-hand function
button 7.
– "Measurement"
– "Emissivity" c:
A selection of saved emissivity levels is available for
some of the most common materials. Select the appro-
priate material in the "Material" menu item. The corre-
sponding emissivity is displayed in the line below.
If you know the exact emissivity of the object to be meas-
ured, you can also set it as a numerical value in the
"Emissivity" menu item.
– "Reflected temperature":
Setting this parameter improves the accuracy of meas-
uring results, especially with low-emissivity (= high-re-
flection) materials. The reflected temperature normally
corresponds to the ambient temperature.
If there are objects with greatly deviating temperatures
close to highly reflective objects which could affect the
measurement, this value should be adjusted.
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1 609 92A 3RD | (22.8.17)