| This subject involves a platinum resistance online detection system, which can eliminate the error in the measurement of platinum resistance though the mathematics modeling of the software. This system measures platinum resistance at one hundred degrees and zero degree and then gets platinum resistance ratio of 100 degrees, Dispelling the error so as to improve die efficiency of resistance distinguishing work from the origin of producing the error of thermal resistance of platinum. This system uses thermal resistance Pt100 with better performance evaluation as temperature sensor, and uses constant current source circuit to obtain signal, Adopts 24 high-accuracy ADUC824 data gather chip, thus remove the signal amplifying, improve the accuracy of measurement, and design RS232 bus communication interface circuit To correct the error of circuit resistance brought by 2-line, the outer line of Pt100 adopts 4-line ways. For improving systematic anti-interference performance, the measuring of temperature adopts digit filter algorithm. This article gives overall theory analysis around the factors of producing error, and measures the voltage though the method of contrasting between standard platinum resistance and await measuring platinum resistance The experiment proves that original designs has reached the expected demand. System formed by this subject has such characters as simple structure, low price,high measuring precision,wide range,etc. It has certain practicality and higher society popularized value.
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