12 GMC-I
Messtechnik
GmbH
5
Infrared Thermometer Mode of Operation and Parameters Configuration
5.1
Field of Vision Ratio
The field of vision is the instrument’s viewing angle. It is determined by
the utilized optics. The FOV (
f
ield
o
f
v
ision, also D:S) is the relationship
between the distance of the measuring instrument from the object to
be measured and the diameter of the spot. The smaller the object to
be measured, the closer you should be to it.
Ideally, the diameter of the spot is smaller than the diameter of the
object to be measured. If this is the case, ambient radiation can be
ignored.
5.2
Emissivity – Parameter
Emissivity is a measure of an object’s ability to emit or absorb energy.
Perfect emitters have an emissivity value of 1, which means that they
reemit 100% of the energy to which they are exposed. An object with
an emissivity value of 0.8 absorbs 80% of the energy to which it is
exposed, and reemits 20%. Emissivity is defined as the relationship of
the amount of infrared energy which is emitted by an object at a
specified temperature to the amount of infrared energy which is
emitted by a perfect emitter at the same temperature. Emission values
lie within a range of 0.0 and 1.0 (see chapter 8.1).
➭
Repeatedly press the
MODE
key until
appears at the display in
order to set the emissivity parameter.
➭
Select the desired value with the
and
keys.
Spot Diameter
Distance
19 mm
0.5 m
20 mm
1 m
64 mm
2 m
