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42515-EU V4.1 2/09
7
IR Measurement Notes
1. The object under test should be larger than the spot (target) size calculated by the field
of view diagram (printed on the side of the meter and in this guide).
2. Before measuring, be sure to clean surfaces that are covered with frost, oil, grime, etc.
3. If an object's surface is highly reflective, apply masking tape or flat black paint to the
surface before measuring. Allow time for the paint or tape to adjust to the temperature
of the surface it is covering.
4. Measurements through transparent surfaces such as glass may not be accurate.
5. Steam, dust, smoke, etc. can obscure measurements.
6. The meter automatically compensates for deviations in ambient temperature. However,
it can take up to 30 minutes for the meter to adjust to extremely wide 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.
Field of View
The meter’s field of view is 13:1. For example, if the meter is 13 inches from the target
(spot), the diameter of the target must be at least 1 inch. Other distances are shown in the
field of view diagram. Note that measurements should normally be made as close as
possible to the device under test. The meter can measure from moderate 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.
2cm
4cm
8cm
16cm
26cm
104cm
52cm
208cm
Diameter of Spot
Distance to Spot