TESTO 876, Инструкция по эксплуатации

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6 Using the product
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Material (material temperature) Emissivity
Steel, heat-treated surface (200 °C) 0.52
Steel, oxidized (200 ) 0.79
Clay, burnt (70 °C) 0.91
Transformer paint (70 °C) 0.94
Brick, mortar, plaster (20 °C) 0.93
Reflected temperature
Using this offset factor, the reflection is calculated out due to the
low emissivity and the accuracy of the temperature measurement
with infrared instruments is improved. In most cases, the reflected
temperature is identical to the ambient air temperature. Only when
objects with strong emissions with much higher temperatures (such
as ovens or machines) are in the proximity of the object being
measured should the radiation temperature of theses heat sources
be determined and used (e.g. using a globe thermometer). The
reflected temperature has only little effect on objects with high
emissivity.
Set emissivity/reflected temperature
You can choose between a user-defined emissivity and 8 materials
with recorded emissivities.
The reflected temperature can be set individually.
The designation of the materials in the selection list is
configured during commissioning of the thermal imager in
the language selected by the user. A translation does not
occur in the event of subsequent changeover of the
language in the instrument.
Using the PC software, other materials can be imported into
the instrument from an existing list. The language for the
materials here depends on the operating system language
of the PC.
1. [OK] | Emissivity… | [OK] .
- The Emissivity dialogue is opened.
2. Move Joystick up/down to select the desired material.
- The selected material is highlighted orange ( ). The
corresponding emissivity is shown to the right next to the
material.