Fluke 568 User Manual download pdf (Page 21)

Infrared Thermometers

Operating the Thermometer

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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Figure 5. Distance and Spot Size

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Fluke 568 User Manual Page 21