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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

Black Hot Isotherm

Rainbow Isotherm