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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.  
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eyl06.eps 
 
Figure 5. Distance and Spot Size