Design of Dual Constant Current Source-excited Temperature Measuring Circuit and Protective Circuit for Pt Resistances
Three-wire Pt resistance is a commonly used temperature sensor which has the advantages of stable perform-ance,wide measurement range,and fast response.Three-wire Pt resistances have found wide application in power sys-tems,while nevertheless may be affected by disturbing factors and bring about additional errors.To avoid and reduce the impact of additional errors on measurement accuracy in actual use,this work designed a dual constant current source-ex-cited temperature measuring circuit based on the NSA2862 X chip and calculated relevant parameters.Apart from the tem-perature measuring circuit,an anti-interference protection circuit and the data transmission mode were also designed to meet the requirements for industrial electromagnetic compatibility.Finally the rationality,reliability and practicability of the circuit were experimentally verified.
dual constant current sourcesthree-wire Pt resistancetemperature measurement circuitNSA2862XEMC
万方数据
维普
