Transcription of A Basic Guide to RTD Measurements - TI.com
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A Basic Guide to RTD Measurements - TI.com
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 ,Three-Wire,and a IDAC2to Chopthe.
The change in resistance of a PT100 RTD from –200°C to 850°C is displayed in Figure 1. Figure 1. PT100 RTD Resistance From –200°C to 850°C While the change in RTD resistance is fairly linear over small temperature ranges, Figure 2 displays the resulting non-linearity if an end-point fit is made to the curve shown in Figure 1.
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