Performing The Measurement - VOLTCRAFT WB-100 Bedienungsanleitung

10. PERFORMING THE MEASUREMENT

Open the camera lens cover (5) and point the thermal imaging camera at the object
to be measured.
Use the up (a) or down (d) button to adjust transparency of the overlay between the opti-
cal camera and the thermal imaging camera.
Notes on temperature measurement
All objects radiate heat energy in the infra-red range. The amount of energy
depends on the surface temperature and the surface emission (emission value)
of the material. This energy is recorded by the sensor of the meter and calculated
based on an emission value matching the material. It is then displayed as a
measured value. Most materials, such as painted metals, wood, water, skin and
clothing are easy to measure due to their surface properties. Their emission factor
is usually above 0.90. This is different for very glossy, reflective surfaces, such as
uncoated metals. They have strongly deviating emission factors of less than 0.60.
Their reflective surfaces make precise measurements difficult. To get precise
measuring results, the emission value must therefore be corrected depending on
material and surface properties.
Compensation of the reflection temperature (RTC)
The heat energy recorded by the camera contains not only the actual heat
radiation emitted by the measured object, but also the reflection of the ambient
radiation (degree of reflection). To get precise measuring results, they must be
compensated. Measured objects with emission factors down to approx. 0.60 have
a low degree of reflection; objects with low emission factors, in contrast, have a
high degree of reflection that must be compensated for. The ratio between ambi-
ent temperature and measured object temperature must be observed as well.
The higher this difference, the larger the deviation of the measurement and the
compensation need. Under such conditions, a multiple measurement should be
performed to achieve precise measured values as well.
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