Fluke Thermometer 576 - Manual (Page 14)

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Emissivity - Explanation
Reflected energy
Emitted energy
Transmitted energy EMISSIVITY
Target
The amount of infrared
energy radiated by an
object depends on its
emissivity and its
temperature.
The emissivity depends on
the material and its surface
characteristics. For more
accurate readings, adjust
the emissivity value for
the type of material being
measured.