pt100查表、线性插值算法.docx

PT100, 2分法， 查表， 根据电阻值计算温度float code RTD_TAB_PT100211 = / 表格是以5度为一步，即-200, -195, - 190.18.52,20.68,22.83,24.97,27.10,29.22,31.34,33.44,35.54,37.64, / -200 -155 1039.72,41.80,43.88,45.94,48.00,50.06,52.11,54.15,56.19,58.23, / -150 -10560.26,62.28,64.30,66.31,68.33,70.33,72.33,74.33,76.33,78.32, / -100 -5580.31,82.29,84.27,86.25,88.22,90.19,92.16,94.12,96.09,98.04, / -50 -5100.00,101.95,103.90,105.85,107.79,109.73,111.67,113.61,115.54,117.47, / 0 45119.40,121.32,123.24,125.16,127.08,128.99,130.90,132.80,134.71,136.61, / 50 95138.51,140.40,142.29,144.18,146.07,147.95,149.83,151.71,153.58,155.46, / 100 145157.33,159.19,161.05,162.91,164.77,166.63,168.48,170.33,172.17,174.02, / 150 195175.86,177.69,179.53,181.36,183.19,185.01,186.84,188.66,190.47,192.29, / 200 245194.10,195.91,197.71,199.51,201.31,203.11,204.90,206.70,208.48,210.27, / 250 295212.05,213.83,215.61,217.38,219.15,220.92,222.68,224.45,226.21,227.96, / 300 345229.72,231.47,233.21,234.96,236.70,238.44,240.18,241.91,243.64,245.37, / 350 395247.09,248.81,250.53,252.25,253.96,255.67,257.38,259.08,260.78,262.48, / 400 445264.18,265.87,267.56,269.25,270.93,272.61,274.29,275.97,277.64,279.31, / 450 495280.98,282.64,284.30,285.96,287.62,289.27,290.92,292.56,294.21,295.85, / 500 545297.49,299.12,300.75,302.38,304.01,305.63,307.25,308.87,310.49,312.10, / 550 595313.71,315.31,316.92,318.52,320.12,321.71,323.30,324.89,326.48,328.06, / 600 645329.64,331.22,332.79,334.36,335.93,337.50,339.06,340.62,342.18,343.73, / 650 695345.28,346.83,348.38,349.92,351.46,353.00,354.53,356.06,357.59,359.12, / 700 745360.64,362.16,363.67,365.19,366.70,368.21,369.71,371.21,372.71,374.21, / 750 795375.70,377.19,378.68,380.17,381.65,383.13,384.60,386.08,387.55,389.02, / 800 845390.48 / 850;/*FunName: float CalculateTemperature(float fR)*In: fR - PT100的电阻值。* *Out: fTem - 测得的温度值。 *Discription: 将电阻值查表算出温度值。*Notes: 采用2分查找法。 */float CalculateTemperature(float fR) float fTem; float fLowRValue; float fHighRValue; int iTem; uchar i; uchar cLimite = 0xFF; uchar cBottom, cTop; if (fR RTD_TAB_PT100210) / 电阻值大于表格最大值，超出量程上限。 return EXCESS_UP_LIMITE; cBottom = 0; cTop = 210; for (i=105; (cTop-cBottom)!=1; ) / 2分法查表。 if (fR RTD_TAB_PT100) cBottom = i; i = (cTop + cBottom) / 2; else iTem = (uint)i * 5 - 200; fTem = (float)iTem; return fTem; iTem = (uint)i * 5 - 200; fLowRValue= RTD_TAB_PT100cBottom; fHighRValue = RT