Thermistor basic application circuit b

  
As shown for the basic application circuit thermistor. Figure (a) of the basic temperature measurement circuit. The circuit temperature measurement accuracy is not high, can on

ly be used for less demanding precision applications. RT is a positive temperature coefficient thermistor, the temperature rises, the output voltage vo is increased, decreased and vice versa; RT negative temperature coefficient thermistor, the temperature rises, the output voltage vo is lowered, increased and vice versa. Figure (b) is measured using a thermistor temperature differential operational amplifier circuit, temperature measurement accuracy improved. This circuit can detect a temperature difference between two points, which when RTi RT2 at a temperature lower than that RTi, operational amplifier (a) end potential is higher than (+) side potential, the output low; similarly, month in which temperature l rt2 when at high. fig il (c) use of an and logarithmic diode measurement circuit, thermistor linear compensate, rp adjustable gain amplifier, thereby further improving characteristics.




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