Techniques Of Infrared Thermometer; Field Of View(Fov) Ratio - Sentry ST 660 Instruction Manual

5.Techniques Of Infrared
Thermometer

5-1 Field of view(FOV) ratio

=Distance to diameter (DS) ratio
The field of view is the angle of vision at which the
instrument operates, and is determined by the
optics of the unit. The FOV is the ratio of the
distance from the target to the target diameter. The
smaller the target, the closer you should be to it.
When the target diameter is small, it is important to
bring the thermometer closer to the target to insure
that only the target is measured.
78@1000
48@500
S
mm
34@250
3.1@40
1.9@20
1.4@10
inch
D
D:S=12:1
6 Broad Temp. Infrared Thermometer