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Zenmuse H20
N
User Manual
©
2022 DJI All Rights Reserved.
15
Temperature measurement accuracy is affected by various factors:
1. Reflectivity of objects - Shiny metals with high reflectivity will reflect more of the background
radiation and result in lower accuracy, whereas objects with matte surfaces will produce higher
accuracy.
2. Temperature of background radiation – Sunlight affects temperature measurement accuracy, so
the infrared thermal camera should be kept out of exposure to direct or reected sunlight.
3. Air temperature and humidity – Temperature and humidity resistance has been calibrated before
delivery, but some temperature measurement errors are inevitable. Extreme temperatures or
humidity levels will affect measurement accuracy.
4. Distance between the camera and the object – The default distance used in calibration is 5 m,
which generates the most accurate temperature measurement. Deviations from this distance will
lower the accuracy.
5. Emissivity of objects – The emissivity of the object will affect temperature measurement accuracy.
Generally, accuracy increases proportionally to emissivity. Emissivity is affected by factors such as
the material, or the roughness or degree of oxidation of the object’s surface.
When measuring a blackbody 5 m away at 25° C in a windless indoor environment, using the
High Gain Mode, the wide infrared thermal camera provides an accuracy of up to ±2° C or ±2%
(whichever is the larger value), and the tele-infrared thermal camera provides an accuracy of
up to ±5° C or ±4% (whichever is the larger value). Since the emissivity of different blackbody
varies, this measurement result only represents the accuracy of the tested blackbody and is for
reference only.
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