暖气热表的温度校正

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1、TexasInstrumentsIncorporatedGeneralInterestۉፆ࿒܈ॠഗڦఇె၍ႠࣅፕኁǖBruceTrumpLjڤዝᅏഗ(TI)रຍጆॆፇׯᇵۉፆ࿒܈ॠഗ(RTD)׉ᆩᇀ߾ᄽࢅ੔ბFigure1.ResistanceofPt100RTDversustemperature཮1Pt100RTDڦ܈࿒ᇑፆۉ൸၍࠲ဣ࿒܈ଉăፌྺ׉९ڦૌ႙๟كմূ(Pt)၍Ljईኁॽكմূ౪໫ྺएӱฉڦԋೌă400໲்ۼ૧ᆩକኄዖࡍূຌۉፆໜ࿒܈ܸՎࣅڟ࿒گሞLjႠຌዖኄăႠຌڦ800°C350ᅜฉߛ࿒ۨ

2、࿘׉ݥۼLjྷݔࢅᆶၳLj੗ᅜ300ํ၄߳ዖ࿿૙ದዃĂۉፆݔྷࢅ৛ඓ܈1ă׉ᆩڦ՗๖݆ĐPt100đLj՗๖0°C#250้100ΩۉፆăCallendar-VanDusenݛײ200๕௮ຎକRTDۉፆࢅ࿒܈ኮक़ڦ࠲ဣLjCurvaturedueto150100#at0°Csecond-orderResistance()nonlinearityഄ߲߳ኵۨᅭසူǖ100R0ྺ0°C้100ΩۉፆDŽPt100Dž50–3A=3.9083×100–1000100200300400500600700800–7B=–5.

3、775×10Temperature(°C)T>0°C้LjC=0LjईኁT<0°C้LjC=–4.23225×10–12ăሀ0.39%/°C้LjPt100RTDڦۉፆໜ࿒܈ܸሺेă৑࠶໲்ᇺԲඤۉ౾၍ႠLjڍ๟௅100°CଉݔྷLjRTDᆶሀ0.38%ݥዖኄăDž1཮९DŽႠ၍ݥ঩ܾ၂௽ڦ၍Ⴀཚ׉੗ᅜཚࡗຕጴݛ݆ڥڟৰኟLjڍᆶႹܠᆌᆩڦRTD๟ྜඇڦఇెت૙ࢅ၍ႠࣅăFigure2.RTDvoltageversustemperature཮2RTDڦ܈࿒ᇑუۉ࠲ဣ൸၍཮Ԩ࿔ॽྺ౞঻ถᅃዖํ၄RTD၍Ⴀࣅڦఇెरຍăኄ

4、ዖरຍ࣏ᆩᇀൃথدߌഗLj૩සǖRTDvoltageisუፇॲڪăԨ࿔ڦᅃၵᇱሶLjᄺ๢ᆩᇀഄ໱ᆶgraduallyboostedwithincreasingܾ঩؜๼नᄺLjॲഗଉ୲ԲڦႠ၍ݥᇑघ૤excitationcurrentۉუईۉୁׯኟԲڦ໯ᆶدߌഗईኁဣཥăAVOUT཮2ዐডྺੲቧڦ൸၍཮՗௽Lj࿒܈ဣཥໜ࿒܈ืߛܸ३ၭLjܸٗሞዐक़ႚׯᅃ߲ၠฉڦࠇoltageRTDႚă0°Cᅜฉ้LjPt100ڦՔጚࣅຕ਍ਏᆶᅃRTDVRTDresistanceዖྜඇܾ঩नಙ࿿၍ࡧຕă्ยሞଇ߲఍܋࿒withsec

5、ond-ordernonlinearity܈ت܈࿒ۅዐሞဃڦิഄሶLjጚၯႜ৊ت(exaggerated)ٳڟፌٷăۉRTDڦڟڥLj้૤घᇸୁۉ߲ᅃᆯRTDړუᇑۉፆׯኟԲLjܸٗิ၎ཞڦݥ၍ႠăڍRTDTemperature๟Ljසࡕघ૤ۉୁໜRTD࿒܈ฉืܸደॷሺ21AnalogApplicationsJournal4Q2011www.ti.com/aajHigh-PerformanceAnalogProductsGeneralInterestTexasInstrumentsIncorporatedेLj

6、ሶኄዖݥ၍Ⴀ੗ᅜڥڟٷٷইگă཮2၂๖କᅃ߲փሺेڦघ૤ۉୁLj཮Figure3.PercentageofRTDerrorversustemperature3RTDဃӥԲᇑ࿒܈൸၍ܔԲ࠲ဣ཮ഄઠጲሺഽڦRTDۉუڦ๼؜ăํाฉLj޿ۉୁ๟ኟݒઍڦ๴੦ۉୁă໲4.0ิକᅃዖᆶ඀ڦĐံᆶच࣏๟ံᆶڒđ3.5၄ၡǖݣٷഗ๼؜ԥ၍Ⴀࣅ้Ljݣٷ3.0NonlinearityofRTDഗ๼෇܋ڦRTDۉუԥ၍ႠࣅLjݒኮᅨfor900Cspan°඗ăኟඓڦኟݒઍଉ֍੗ཞ้ํ၄ฉຎ2.5)ଇዖ၍Ⴀࣅă(%2.0Corre

7、ctedoutputwithnonlinearitypeaksڦၭ߸ዖᅃLj้ࣅᆫႜ৊ઍݒኟܔړS1.5at¼and¾scaleErrorႚဃධ඗٪ሞLj൐ਏᆶٷሀ၎ڪڦኟ1.0Zeroerrorat޶ኵLjഄሞ¼ࢅ¾஢ଉײ้ٳڟፌٷmidscaleand0.5endpointsኵDŽ९཮3DžăኄዖएԨෙ঩ݥ၍Ⴀ0.0ժݥઠጲᇀRTDLjܸ๟ኄዖ၍Ⴀࣅरຍٷڦ໲ă೗ޭڦၭൽਦᇀ၍Ⴀࣅ჋–0.5–1000100200300400500600700800ስڟC°100–କ၂๖3཮ăྷݔ܈࿒ڦTemperature(

8、°C)+800°C࿒܈ݔྷDŽ၎900°CDžڦ؛๔ݥ၍Ⴀဃăዐक़ଉײڦ3.7%RTDڦઠᇱྺৈLj%11.0±ሀ዁ইႠ၍ݥ1/33ă࿒܈ݔྷ߸ၭ้Ljኄዖ߀฀൧઄཮Figure4.TypicalRTDconfigurationwitherrorcompensation4ဃց׋ۆ႙RTDದዃࣷ߸े௽၂Lj200°Cݔྷ้੗३ณ150ԠኮܠLjन३ณ዁ᇱઠڦ1/150ăR2+๑ᆩኟڦۨ࿘փୟۉेሺࣷઍݒ੗ీV49.13k#REF5VR3ႠăڟၭLjၭڦ׉ݥଉઍݒዖኄLj๟