Any infrared measuring instrument is to measure the infrared radiation power on the surface of the electrical equipment to obtain the temperature information of the equipment. And in the case of infrared diagnostic instruments receive the same infrared radiation power from the target, due to the different emissivity of the surface of the target, will get different detection results. That is to say, for the same radiant power, the lower the emissivity, the higher the temperature will be displayed. The emissivity of the surface of the object is mainly determined by the nature of the material and the state of the surface (e.g. oxidation of the surface, coating material, roughness and dirtiness, etc.). Therefore, in order to measure the temperature of electrical equipment accurately with infrared thermal imaging instruments, it is necessary to know the emissivity value of the inspected target and enter this value into the computer as an important parameter for the calculation of the temperature or to adjust the ε-correction value of the infrared measuring instrument in order to correct the emissivity of the measured temperature output value. Eliminate the impact of emissivity on the detection results of the other two countermeasures are: when using infrared thermal imaging camera for measurement, the emission to be corrected, find out the emissivity value of the measured surface of the equipment components for emissivity correction, so as to obtain reliable temperature measurement results, improve the reliability of the detection; for infrared detection of fault-frequent parts of the equipment, in order to make the results of the detection of a good comparability, can be applied to apply appropriate For infrared detection of fault-frequent equipment components, in order to make the detection results have good comparability, can be used to apply appropriate paint to increase and stabilise the emissivity value, in order to obtain the true temperature of the surface of the equipment under test.

The slope is the ratio of the emissivity in the monochrome broadband mode to the emissivity in the monochrome narrowband mode, and is used in the two-colour temperature measurement mode to calculate the measured temperature. Since the emissivity in narrowband mode cannot be adjusted, it is found by dividing the monochrome broadband emissivity by the slope value.

If you need to note the narrowband temperature, make the narrowband emissivity greater than 1.00 (or less than 0.10) by adjusting the slope and broadband emissivity.

Emissivity is a measure of an object's ability to radiate infrared light. This value can range from {{0}} (specular) to 1.0 (blackbody), and if the emissivity is set to a value greater than the actual emissivity, the sensor head will read low. For example, if the actual emissivity of an object is 0.9 and the setting is 0.95, the measured temperature will be low.