NTC thermistor B value is introduced
B value is thermistor material constant, namely thermistor chip ( A kind of semiconductor ceramic) After high temperature sintering, the resistivity of formation has certain data, each only a B value formula and sintering temperatures, so the kind of material constant.
B value can be measured at 25 ℃ and 50 ℃ ( Or 85 ℃) When the resistance is calculated after. B value positively related to the product temperature coefficient of resistance, that is to say, B value, the greater the its temperature coefficient of resistance.
1 ℃ temperature coefficient is higher, the resistance value of the rate of change. Using the following formula B values can be converted to temperature coefficient of resistance, temperature coefficient of resistance T ^ 2 T = B value to the point of absolute temperature conversion) NTC thermistor is in commonly 2000 k - B 6000 k, can't simply say B value is big, or as small as possible, to see where you are using. In general, as temperature measurement, temperature compensate and inhibiting surge resistance with the products, under the same conditions is B value larger good. Because as the change of temperature, B value of product changes its resistance value is bigger, that is more sensitive.
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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor