403265 Datasheet, PDF (4/8 Pages) Extech Instruments Corporation. – Non-Contact Infrared Thermometer

Field of View
The meter’s field of view is 10:1; For example, if the meter is 10 inches from the target, the
diameter of the object under test must be at least 1 inch. The object under test should
actually be larger than the spot size shown in the diagram below. The smaller the target,
the closer the meter should be to the target. As the distance from the target increases, the
area measured by the meter (spot) becomes larger.
Diameter of Spot in inches
3
2
0.5
1
5
10
20
30
Sensor Beam
0.63”
Laser Beam
Distance to Target in inches
4
403265 Version 1.7 2/05