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How critical is focusing the instrument?

April 26, 2017critical focusing instrument

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How critical is focusing the instrument?

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All infrared thermometers have a specific target size they need to see in order to measure the temperature. The target should be 2 times the spot size in order to indicate the correct temperature. If the target is smaller than the spot the instrument will measure any thing that is filling the remainder of the target. This is not true of a two-color instrument.