High Low Limits; Measurement Notes - Extech Instruments IR300UV User Manual

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.
Lens Cover
The lens cover protects the lens from dust when the meter is not in use. Always close the cover
when storing the meter.
Measurement Notes
1. The object under test should be larger than the spot (target) size calculated by the field of
view diagram.
2. If the surface of the object under test is covered with frost, oil, grime, etc., clean before
taking measurements.
3. If an object's surface is highly reflective apply masking tape or flat black paint to the surface
before measuring.
4. The meter may not make accurate measurements through transparent surfaces such as
glass.
5. Steam, dust, smoke, etc. can obscure measurements.
6. The meter compensates for deviations in ambient temperature. It can, however, take up to
30 minutes for the meter to adjust to extremely wide ambient temperature changes.
7. To find a hot spot, aim the meter outside the area of interest then scan across (in an up and
down motion) until the hot spot is located.
8. When the meter is held at the optimum distance from the target, the single laser dot will
appear at the top of the circular laser target. As long as the single laser dot is within the
circular laser target, the meter will make an accurate measurement.
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EXTECH INSTRUMENTS