Fluke 572-2 - Locating Thermal Spots; Understanding Distance to Spot Size

572-2
Users Manual
12
Locate a Hot or Cold Spot
To find a hot or cold spot, aim the Product outside the desired area. Then, slowly
scan across the area with an up and down motion until you locate the hot or cold
spot (see Figure 4).
hdp04.eps
Figure 4. Locating a Hot or Cold Spot
Distance and Spot Size
As the distance (D) from the object being measured increases, the spot size (S) of
the area measured by the Product becomes larger. The relationship between
distance and spot size (D:S) for each Product is shown in Figure 5. The spot sizes
indicate 90 % encircled energy.
D:S=60:1
D
S
20.77 mm @ 500 mm
(.82 ” @ 19.69 ”)
19.17 mm @ 1150 mm
(.75 ” @ 45.28 ”)
31.70 mm @ 1500 mm
(1.25 ” @ 59.05 ”)
21.38 mm @ 250 mm
(.84 ” @ 9.84 ”)
hdp05.eps
Figure 5. Distance and Spot Size
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