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1、测量热敏电阻的温度特性（Measurethetemperaturecharacteristicsofthethermistor）Experiment8measurementofresistancetemperaturecharacteristicsofthermistorsExperimentalpurpose1.Therelationshipbetweenthermistorandtemperatureismeasuredbythermometeranddirectcurrentbridge;2,grasptherelationshipbetweentheresistanceval
2、ueofNTCthermistorandtemperature,andlearnhowtoobtainempiricalformulabydataprocessing.ExperimentalinstrumentTemperaturesensor,temperaturecharacteristictester,resistancebox,DewarbottleExperimentalprincipleThermistorsareusuallymadeofsemiconductingmaterials,andtheirresistancevariessharplywithtempera
3、ture.Thermistorisdividedintonegativetemperaturecoefficient(NTC),thermistorandpositivetemperaturecoefficient(PTC)thermistortwokinds.NTCthermistorsareverysmallinsize,andtheirresistancetotemperatureismuchmoresensitivethanmetalresistance.Therefore,itiswidelyusedintemperaturemeasurement,temperaturec
4、ontrol,temperaturecompensationinthecircuit,timedelayandsoon.PTCthermistorisdividedintotwocategories:ceramicPTCthermistorandorganicmaterialPTCthermistor.ThePTCthermistorisakindofnewmaterialresistordevelopmentintheearly1980s,itischaracterizedbythepresenceofamutationpointtemperature,whenthetempera
5、tureofthematerialismorethanthemutationpointtemperature,theresistanceincreased5-6orders(forexampleby101surgedtoover107ohms),soithastheapplicationvalueofextremelywide.Inrecentyears,ourcountryhasmadegreatprogressinthedevelopmentandapplicationofPTCThermistordevices,PTCthermistorceramicsduetoitslarg
6、epowerandgoodheatresistance,hasbeenappliedinindustriessuchasmachinery,refrigeratorsforcurrentoverloadprotection,Andcanreplacethenickelchromiumelectricheatingwiresasthermostaticheaterandtemperaturecontrolcircuitforselfheatingtypeelectricheater,anewautomatictemperaturecontroldryingmachine,allkind
7、sofelectricheaterandaseriesofsafehouseholdappliances;andthethermalresistanceoforganicmaterialPTChasshortoperationtime,smallvolume,lowresistance,hasbeenusedfordomestictelephoneswitches,portablecomputer,portablecordlessphonesandothe
