Fluke 576 FE 576 Users Manual - Page 13
Spot Size, is 60:1Standard Focus or 50:1 Close Focus - infrared thermometer
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Spot Size SPOT DIA. (IN) 0 20 30 36 46 48 60 72 84 100 108 120 STANDARD MODEL Optical Chart DISTANCE: SENSOR TO OBJECT (IN) 0.76 IN @ 46 IN 2.5 2.9 2.3 1.0 0.9 0.87 0.81 0.82 1.2 1.51 1.85 576 SPOT DIA. (mm) 0 100 250 500 1000 1500 2000 2500 3000 24 23 24 19.8 29.0 19 mm @ 1150 mm 44.0 58.0 72.0 SPOT DIA. (IN) DISTANCE: SENSOR TO OBJECT (mm) FOCUS POINT D:S = 60:1 FAR FIELD D:S = 35:1 CLOSE FOCUS MODEL Optical Chart DISTANCE: SENSOR TO OBJECT (IN) 0 2 4 6 7.9 9.8 20 0.24 IN @ 11.8 IN 1 0.9 0.75 0.62 0.49 0.37 0.93 25 22 18,7 15,5 12,3 9,2 23 6 mm @ 300 mm 0 50 100 150 200 250 500 DISTANCE: SENSOR TO OBJECT (mm) FOCUS POINT D:S = 50:1 FAR FIELD D:S = 12:1 40 2.81 Close Focus 70 1000 SPOT DIA. (mm) The measured spot size depends on the distance between the object you are measuring and the infrared thermometer. The relationship between distance and spot size is 60:1(Standard Focus) or 50:1 (Close Focus) at the focus point. The D:S in the far field (>33ft/ 10m) is 35:1 (Standard) or 12:1 (Close Focus). 13