Distance to Spot Ratio (Field of View)
The meter’s field of view is 12:1 (distance to spot ratio). For example, if
the meter is 60cm (24 inches) from the target (spot), the diameter of the
target must be at least 5cm (2 inches).
Note that measurements should normally be made further than 60cm
(24 inches) from the target. The meter can measure from further
distances but the measurement may be affected by external sources of
light. In addition, the spot size may be so large that it encompasses
surface areas not intended to be measured
Emissivity
Emissivity represents the energy reflectivity of a material. Most organic
materials and painted or oxidized surfaces have an emissivity of
approximately 0.95. If possible, masking tape or flat black paint should
be applied to cover the measured surface.
Wait a period of time to allow the tape or paint to reach thermal
equilibrium with the surface of the covered object. Measure the
temperature of the surface covered with tape or paint only after
equilibrium has been achieved.
High Low Limits
The HI / LO limits provide an alarm when a preset temperature is
exceeded.
