暖气热表的温度校正.pdf

21Analog Applications Journal4Q 2011 High-Performance Analog ProductsTexas Instruments IncorporatedGeneral Interest?Bruce Trump?(TI)?(RTD)?(Pt)?800C?1?Pt100?0C?100?Callendar-Van Dusen?RTD?R0?0C?100?Pt100?A=3.9083 103B=5.775 107T 0C?C=0?T 0C?C=4.23225 1012?0.39%/C?Pt100 RTD?100C?RTD?0.38%?1?RTD?RTD?2?0C?Pt100?RTD?RTD?RTD?4003503002502001501005001000100200300400500600700800Temperature(C)Resistance()?100at 0C?Curvature due tosecond-ordernonlinearityFigure 1.Resistance of Pt100 RTD versus temperature?1 Pt100 RTD?RTD TemperatureRTD VoltageRTDVOUTARTD voltage isgradually boostedwith increasingexcitation currentRTD resistancewith second-ordernonlinearity(exaggerated)Figure 2.RTD voltage versus temperature?2 RTD?2?RTD?RTD?S?3?RTD?3?100C?+800C?900C?3.7%RTD?0.11%?1/33?200C?150?1/150?4?RTD?R1?VREF?R5?A1?R2?R3?R4?TI?OPA188*?TI OPA277?RTD?RTD?VREF?R1?R5?VOUT?Texas Instruments IncorporatedGeneral Interest22Analog Applications JournalHigh-Performance Analog Products 4Q 20114.03.53.02.52.01.51.00.50.00.51000100200300400500600700800Temperature(C)Error(%)Corrected output withnonlinearity peaksat and scaleNonlinearity of RTDfor 900 C spanZero error atmidscale andendpointsFigure 3.Percentage of RTD error versus temperature0C to200CPt100100?R14.99 k?R41 k?R5106.18 k?R360.44 k?R249.13 k?A1OPA188V0 V at 0C5 V at 200COUTV5 VREF+Figure 4.Typical RTD configuration with error compensation?3 RTD?4?RTD?RTDRTDRTDRTDRTDREFOUTRTDRTDRTDRTDRR5RR1RR5RR1VVVRR5RR1R1R5RR5RR1?R5?RTD?R5?R5?Excel?lit/zip/SLYT442?WinZip?WinZip?RTD_Linearization_v7.xls?SPICE?WinZip?TINA-TI SPICE?RTD?RTD?SPICE RTD?2?5?RTD?500C?2%?RTD?500C?8%?RTD?Pt1000?Pt5000?RTD?RTD?RTD?6?16141210864200100200300400500600700800Temperature Measurement Span(C)Percent()?UncorrectedRTD errorRequired change inexcitation currentFigure 5.Correlation of excitation current to RTD error0C to200CREFPt100100?R14.99 k?R5106.18 k?R64.99 k?R799.9?A1INA826V5 VREFR8801?RGRG+Equal resistance createscommon-mode voltageResistance createscommon-mode voltageV0 V at 0C5 V at 200COUTFigure 6.Amplifier with three-wire RTD connection?5 RTD?6?RTD?23Analog Applications Journal4Q 2011 High-Performance Analog Products?RTD?R5?Texas Instruments IncorporatedGeneral Interest?TI?RTD?1?4?20Ma?XTR106?PGA309?1?en.wikipedia.org/wiki/Resistance_thermometer2?SPICE?Pt100 RTD?Thomas Kuehl?2007?5?28?EN-Genius Network:analogZONE:acquisitionZONE?.pdf3?Bruce C.Trump.?1994?3?3?EDN?htm?OPA277?OPA2188?PGA309?XTR105?XTR106?X T R 10 8?X T R 112?X T R 114?partnumber?Excel?TINA-TI?lit/zip/SLYT442Texas Instruments IncorporatedGeneral Interest?XTR105RTD?1mA?4?20mA?XTR106?4?20mA?XTR108RTD?4?20mA?XTR112?RTD?100-A?4?20mAPt1000 RTD?XTR114?RTD?250-A?4?20mAPt5000 RTD?PGA309?1?RTD?TI?24Analog Applications JournalHigh-Performance Analog Products 4Q 2011Texas Instruments Incorporated31Analog Applications Journal4Q 2011 High-Performance Analog ProductsSLYT437 2011 Texas Instruments IncorporatedDLP is a registered trademark and 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