Field Of View - Extech Instruments 42582 User Manual

Field of View

The meter's field of view is 8:1, meaning that if the meter is 8 inches from the target, the
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diameter of the measurement spot (target) is 1 inch. Other distances and spot sizes are
shown below in the field of view diagram. Refer to the chart printed on the meter also for
more information.
IR Measurement Notes
1. The object under test should be larger than the spot (target) size (use the diagram
above and the diagram printed on the side of the meter to calculate the spot size).
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 before
measuring.
4. The meter may not measure accurately through transparent surfaces such as glass.
5. Steam, dust, smoke, etc. will affect measurements.
6. The meter compensates for deviations in ambient temperature. It can, however, take
up to 30 minutes for 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.
Diameter of Spot
4"
2"
1"
0.5"
4"
8"
16"
32"
Distance from Object
9
Laser pointer
Model 42582 Version 6.0 Sept 2007