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ZENMUSE XT User Manual
White Hot Isotherm
Fusion Isotherm
Spot Meter
The Zenmuse XT can measure the average temperature of the 4×4 pixels in the center of an image
with an accuracy of ±20˚C in High Gain mode, and an accuracy of 20% of the entire temperature
range or 20˚C (whichever is greater) in Low Gain mode.
The spot meter's 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 a larger error; objects with matte surfaces will produce a higher accuracy.
2) Temperature of background radiation - a sunny day without clouds will have less of an effect on
the accuracy than a cloudy day.
3) Air temperature and humidity - the higher the temperature and humidity, the lower the accuracy.
4) Distance between camera and object - the shorter the distance, the higher the accuracy.
5) Emissivity of objects - the higher the emissivity, the higher the accuracy.
Gain Modes
High Gain Mode: The camera covers a smaller temperature range but is more sensitive to
temperature differences.
Low Gain Mode: The camera covers a wider temperature range but is less sensitive to temperature
differences.
Auto Gain Mode (Default): The camera will automatically select the optimal gain mode according to
the temperature range of the image.
FFC Calibration
12
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Black Hot Isotherm
Rainbow Isotherm