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Settings Settings Menu
Emissivity
The Thermal Imager measures and displays the emitted infrared radiation from an object(s).
To accurately calculate temperature (from infrared radiation), the emissivity value of the object
being measured must be entered. The emissivity value is used to effectively calculate the
displayed temperature value.
Emissivity is the amount of radiation emitted from an object, compared to that of a perfect
blackbody (standard of radiation) of the same temperature.
Emissivity can be effected by other factors (listed below), which is beyond the scope of this
manual.
- Core material makeup
- Surface condition
- Temperature
- Angle of view
- Wavelength
As a general rule, objects and surfaces normally exhibit emissivity ranging from approximately
0.1 to 0.95. Materials with smooth (non oxidized) surfaces, usually range from 0.05 to 0.50,
however these values may change if the surface is rough or oxidized.
The Thermal Imager is equipped with five common emissivity value presets (Figure 5-16). Choose
the most applicable setting for your application.
Use the Up / Down control buttons to make a selection from the menu, then press the Y button to
enable the selection, and return to the settings menu.
The default emissivity level setting is Plastic/Rubber, Painted Metal (flat) (0.95).
Figure 5-16 Emissivity Settings Menu
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