Fluke 568 Manual de usuario Pagina 21

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Infrared Thermometers
Operating the Thermometer
13
Distance and Spot Size
As the distance (D) from the object being measured increases, the spot size (S) of the area
measured by the unit becomes larger. The relationship between distance and spot size (D:S)
for each unit is shown in Figure 5. The spot sizes indicate 90 % encircled energy.
568
eyl06.eps
Figure 5. Distance and Spot Size
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