NTC thermistor resistance ratio test method

　　1. Use the LCR tester to measure the resistance value of the NTC thermistor at the oil tank temperature of 25° with zero power resistance, which is the manufacturer's nominal resistance value.

　　2. Raise the temperature of the oil tank to 85°, and measure its zero-power resistance value, record and save it.

　　3. Use the data to calculate the thermal index, that is, the B value.

　　Calculate the B value with the following formula:

　　B=[(Ta×Tb)/(Tb-Ta)]×In(Ra/Rb) or B=2.303×[(Ta×Tb)/(Tb-Ta)]×log(Ra/Rb)

　　Formula description:

　　B: constant (unit is K);

　　Ra: zero-power resistance value (unit: Ω) measured at temperature Ta (unit: K)

　　Rb: zero-power resistance value (unit: Ω) measured at temperature Tb (unit: K).

　　Ta=298.15K1)

　　Tb=358.15K1)

　　NOTE: If the detail specification specifies that the B value is to be determined at other temperatures, the values of Ta and Tb (in K) in place of the preferred numbers should be specified, and this B value should be described as "B."

　　The above is the relevant content of the NTC thermistor B value/resistance ratio test. I hope it will help you. If you have an NTC thermistor, you need to do temperature characteristics test, high and low temperature cycle test, thermal time constant test, and inrush current capability. Test and other NTC thermistor performance test,

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