User Manual

6 Using the product
26
> [OK] | Measurement | Cold-/Hotspot | [OK].
> Select left or right Coldspot or Hotspot quick select button to
activate/deactivate the respective function.
Min./Max. on area (testo 875-2i only)
Min./Max. on area shows the minimum and maximum temperature
value within the area selection shown on the display. The area
selection is neither scalable nor adjustable. If Min./Max. on area is
activated ( ), the quick select buttons with the Scale... and
Emissivity... functions can be permanently assigned and can no
longer be changed.
With frozen images, the crosshairs can be moved. The Min./Max.
on area values are saved together with every image.
With saved images, Min./Max on area must be activated for the
respective opened image.
> [OK] | Measurement | Min./Max. on area | [OK].
Isotherm (testo 875-2i only)
Isotherm shows temperatures in a selectable temperature range in
a uniform colour. If Isotherm is activated ( ), the quick select
buttons with the Isotherm and Emissivity... functions can be
permanently assigned and can no longer be changed.
With frozen images, the crosshairs can be moved.
> [OK] | Measurement | Isotherm | [OK].
To set the isotherm colour and range:
1. [Isotherm]
- The Isotherm dialogue is opened.
2. Move Joystick left/right to select the desired option: Isotherm
colour ( ), lower limit value ( ), temperature range ( ) or
upper limit value ( ).
- The selected option has an orange border ( ).
3. Move Joystick up/down to change the colour or the value(s).
- Changes are applied immediately so that the effects on the
display of the infrared image can be checked directly.
4. Close dialogue with [OK] or [Esc].
- The changes are saved.
Moisture (testo 875-2i only)
The ambient temperature and humidity values entered manually or
measured by the (optional) radio humidity probe are used to
calculate the relative surface moisture for each pixel. The values