Extech Instruments 42510A User Manual page 6

IR Measurement Notes
Field of View
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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 or side to side motion) until the hot spot is located.
The meter's field of view is 12:1. For example, if the meter is 24 inches from the target (spot), the
diameter of the target must greater than 2 inches. Other distances are shown in the field of view
diagram. 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.
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2"
1"
@24"
@12"
2.54cm
5cm
10cm
@30.5cm
@61cm
@122cm
6
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4"
@48"
42510A-EU-EN-V3.4 4/13
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