A PTC thermistor is a resistor. A certain amount of heat will occur when current flows through it. The effect of the amount of PTC thermistor consumption on temperature is indicated by the dissipation constant. It refers to the dissipation of the temperature change of the PTC thermistor. power. The dissipation constant is related to the structure and shape of the PTC thermistor and the type and condition of the medium. What is the input calibration of PTC thermistor and what is its calibration method?
Input calibration of PTC thermistor
The intention is not to detect the resistance value of the PTC thermistor sensor, but to know the temperature value at that time, so it is necessary to confirm the relationship between the resistance value of the thermistor and the detected temperature. The calibration method is as follows.
①Formulation check forms to confirm the relationship between resistance and temperature. Such a form does not work well in practice, because there is a difference in the relationship between the resistance value of the thermistor and temperature.
② Completely rely on practice calibration. Use adjustable thermostats for practical calibration: from the low temperature end to the high temperature end, calibrate 1 point every 1 ~ 5 ° C, and then compare the complete temperature and resistance contact form. The form with this method has higher precision in practical use, because this form completely reflects the real situation. The disadvantage of this method is that it must be calibrated with adjustable constant temperature equipment, which requires relatively high test equipment, otherwise, the accuracy of the data is not ensured.
③Practical calibration is combined with formula calculation.