Focus Control; Field Of View; Temperature Unit; Emissivity - Fluke ThermoView TV40 Series User Manual

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ThermoView TV40 Series
Users Manual, Rev. 1.1, Apr 2019

6.4.5 Focus Control

The camera is equipped with a motorized focus. The focus setting is applied to the infrared image only. Use the
handwheel control to get a sharp image. Clicking on the + and – buttons allows a precise finetuning of the focus
control.

6.4.6 Field of View

<Parallax> – this option brings the visual image as well as possible into the area of the infrared image.
<Full> – this option provides the maximum field of view for the visible camera.

6.4.7 Temperature Unit

This menu allows to toggle between Celsius and Fahrenheit.

6.4.8 Emissivity

<Emissivity> – changes the global emissivity. The global emissivity is used to correct the temperature reading of
the target. The target may read lower than its true temperature, due to the target emissivity being less than 1.
<BG Temp (c)> – compensates the background temperature (BG) of the surrounding area that might be in the
field of view. When the target's emissivity is less than 1, the background temperature can interfere with
measurement accuracy. The error is reduced by accurately setting the background temperature. Sometimes it is
not possible to completely reduce background induced errors because there could be various background objects
of different temperatures reflecting off the target. The best way to minimize these errors is to shield the target as
best as possible from stray radiation paths.
<Transmission> – there could be something in the optical path, such as a window that absorbs a percentage of
the infrared radiation before it gets to the camera. The transmission value is an adequate correction factor to
compensate that effect.
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