Transcription of Thermocouple, Cold-Junction Compensation …
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Thermocouple, Cold-Junction Compensation …
ApplicationReportSLOA204 August2014 Thermocouple, cold -JunctionCompensation AnalogApproachShridharAtmaramMoreABSTRAC TT emperatureis the mostcommonlymeasuredphysicalparameterin a varietyof systems,includingautomotive,industrial,a nd varioustemperaturetransducersavailableto addressthe needof widelypopularbecausetheyare inexpensive,havea widerange,are smallin size,and do not thermocoupletemperature-sensingrequireme nts,particularlycoldjunctioncompensation and how to achievethe of of Tables1 SLOA204 August2014 Thermocouple, cold -JunctionCompensation AnalogApproachSubmitDocumentationFeedbac kCopyright 2014,TexasInstrumentsIncorporatedIntrodu ctionto ThermocouplesThermocouplesare a populartype of relativelylow price,widetemperaturerange,lack of requiredexcitation,long-termstability,an d proficiencywith contactmeasurementsmakethesedevicesvery commonin a widerangeof accuracywith a thermocouplecan be moredifficultthana resistancetemperaturedetector(RTD),the low cost and versatilityof a thermocoupleoftenmakeup for this difficultyin ,in contrastwith thermistorsand RTDs,the use of thermocouplesoftensimplifiesapplicationc ircuitrybecausethey requireno , thesedevicesgeneratevoltagewithoutany , however,requirea stablevoltagereferenceand someformof ice-pointor thermocoupleis a cableof two wiresmadefromtwo dissimilarconductors(usuallyalloys)that aresolderedor weldedtogetherat one end,as shownin Figure1.
Thermocouple Temperature Measurement www.ti.com The system sometimes may need to perform a cold junction compensation in the analog domain instead of the digital domain because of various system restrictions (such as the ADC or …
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