【摘要】 由16位DAC器件作为分压器,设计了恒电位仪以及正反馈补偿电路,实现了对溶液电阻的自动测量和补偿,同时采用高阻抗体系对其溶液电阻测量的准确性和补偿效果进行了验证。结果表明,溶液电阻最高补偿值可达1.0×108Ω,在可补偿电阻范围内,自动电阻测量误差最大不超过1.5%,平均误差小于0.5%。本实验设计的电路可以较精确地控制补偿比例,稳定性好,并且溶液补偿效果较为理想,明显消除溶液电阻引起的电位控制误差,其性能已接近国外主流产品,完全能够满足专业电化学测量研究的需要。更多还原

【Abstract】 A newly home-built electrochemical workstation with a multifunctional positive feedback circuit has been designed by the 16-bit Digital to Analog Converter(DAC) as a voltage divider device for performance evaluation,which allows functions of automatic measurements and compensations of solution resistance when being essential in the experimental research.Both the accuracy and the validity of this proposed design were further closely examined by virtue of a high impedance organic phase test.The experimental results indicated that this home-built electrochemical system was quite stable and reliable due to a wide range of compensations of solution resistance up to 10 MΩ and the averagely relative error within 0.5%.These experiment data showed that the circuit could control the proportion of compensation more precisely and have good stability and ideal compensation effect of solution.Besides that the circuit can significantly eliminate the potential control errors caused by the solution resistence.The performance of our product is close to the mainstream of the foreign products,so it is fully capable of meeting the professional electrochemical measurement needs.更多还原