Technical parameters of thermistor.Wide-Angle Fresnel Lens Processor

　　① Named resistance RC: Generally refers to the actual resistance value of thermistor resistor when the ambient temperature is 25 ° C. ② Actual resistance RT: The resistance value measured under certain temperature conditions.

　　③ Material constant: It is a parameter describing the physical characteristics of the thermistor material, and it is also a thermal sensitivity index. The larger the B value, the higher the sensitivity of the thermistor. It should be noted that in actual work, the B value is not a constant, but a slight increase with the increase in temperature.

　　④ Resistance temperature coefficient αt: It represents the resistance value of the resistance when the temperature changes is 1 ° C, and the unit is%/° C.

　　⑤ Time constant : Thermal resistance is hot inertia. Time constant is a parameter describing thermal resistance of thermistor. It is defined that when the ambient temperature suddenly changes from one specific temperature to another, the temperature of the thermistor changes at 63.2%of the time difference of two specific temperatures. Essence The smaller the , the smaller the thermal inertia of the thermistor.

　　⑥ Rated power PM: Under the specified technical conditions, the dissipation power allowed by the long -term continuous load of thermistor. Do not exceed the rated power in actual use. If the ambient temperature of the thermistor resistance exceeds 25 ° C, its load must be reduced accordingly.

　　⑦ Retine working current IM: The nominal current value specified in the working state in the working state.

　　⑧ Measurement power PC: Under the prescribed environmental temperature, the power consumption consumed by the resistance value caused by heating the test current of the thermistor is not exceeded by 0.1%.

　　N Maximum voltage: For the NTC thermistor resistor, it refers to the maximum DC voltage allowed by the thermistor out of control at the prescribed environmental temperature. In the ambient temperature and static air, it is allowed to be applied to the maximum DC voltage of the normally working part of the PTC characteristic part of the thermistor. M The highest working temperature TMAX: Under the specified technical conditions, the highest temperature allowed by the long -term continuous work of thermistor.

　　: Switch temperature TB: The resistance value of the PTC thermistor resistance starts to increase the temperature when jumping.

　　： Disclosure coefficient H: When the temperature increases by 1 ° C, the power consumed by the thermistor resistance is MW/℃

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