HD200 Datasheet, PDF (5/10 Pages) Extech Instruments Corporation. – Differential Thermometer Datalogger

IR Description
1. Laser Pointer
2. IR sensor
3. Lo Battery led
4. ON/Scan button
5. Cable
IR (Infrared) Thermometer Measurement Considerations
• The object under test should be larger than the spot (target) size calculated by the
field of view diagram.
• If the surface of the object under test is covered with frost, oil, grime, etc., clean
before taking measurements.
• If an object's surface is highly reflective, apply masking tape or flat black paint to the
surface before measuring.
• The meter may not make accurate measurements through transparent surfaces such
as glass.
• Steam, dust, smoke, etc. can obscure measurements.
• 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.
• 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.
• IR measurements cannot be made through glass.
IR (Infrared) Thermometer Field of View
The meter’s field of view is 8:1. For example, if the meter is 16 inches from the target
(spot), the diameter of the target must be at least 2 inches.
Note that measurements should normally be made less than 2 feet 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.
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Model HD200 Version 2.0 December 2007