Transcription of A Basic Guide to RTD Measurements
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1 SBAA275 June2018 SubmitDocumentationFeedbackCopyright 2018,TexasInstrumentsIncorporatedA BasicGuideto RTDM easurementsApplicationReportSBAA275 June2018A BasicGuideto RTDM easurementsJosephWuABSTRACTRTDs,or resistancetemperaturedetectors,are sensorsusedto amongthe mostaccuratetemperaturesensorsavailable, ,gettingaccuratemeasurementswithprecisio nanalog-to-digitalconverters(ADCs)requir esattentionto detailin designof measurementcircuitsand calculationof the an overviewof the RTD,discussingtheirspecifications,constr uction,and detailsin theiruse in shownwitha basicdesignguide,showingcalculationsnece ssaryto determinethe ADCsettings,limit measurementerrors,and verifythat the designfits in theoperatingrangeof the of Figures1PT100 RTDR esistanceFrom 200 C to 850 200 C to 850.
copper. The PT100 is a common RTD constructed from platinum with a resistance of 100 Ωat 0°C. RTD elements are also available with 0°C resistances of 200, 500, 1000, and 2000 Ω. 1.1 Callendar-Van Dusen Equation The relationship between platinum RTD resistance and temperature is described by the Callendar-Van Dusen (CVD) equation.
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