Fluke 574 - Manual (Page 13)

13
574
STANDARD MODEL
Optical Chart
3000
120
1.0
0
0
24
SPOT DIA. (IN)
SPOT DIA. (mm)
DISTANCE: SENSOR TO OBJECT (mm)
DISTANCE: SENSOR TO OBJECT (IN)
FOCUS POINT D:S = 60:1 FAR FIELD D:S = 35:1
0.76 IN @ 46 IN
19 mm @ 1150 mm
1500 2500
100
60
1.2
2.3
2.9
29.0
58.0
72.0
2000
44.0
1000 500 250 100
24
23
30
0.9
0.81 0.82
1.51
1.85
2.5
19.8
108
84 72 48 20 36 46
0.87
CLOSE FOCUS MODEL
Optical Chart
500
20
1
0
0
0.93
25
23
SPOT DIA. (IN)
SPOT DIA. (mm)
DISTANCE: SENSOR TO OBJECT (mm)
DISTANCE: SENSOR TO OBJECT (IN)
FOCUS POINT D:S = 50:1 FAR FIELD D:S = 12:1
0.24 IN @ 11.8 IN
6 mm @ 300 mm
Close Focus
6
0.62
15,5
150
2
0.9
22
50
4
0.75
18,7
100
7.9 9.8
200 250
0.49 0.37
12,3 9,2
40
1000
2.81
70
The measured spot size depends on the dis-
tance 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).
Spot Size