SDD型数字电导仪改进设计

Improving design of SDD model digital conductivity meter

本文针对SDD型数字电导仪存在的问题，提出改进设计方案，采用双极性脉冲电导测量法代替电容补偿法，达到在全量程范围内消除电极极间电容和极化电容所造成的测量误差。本设计以8098单片机作为控制器和处理器。简化了电路结构，提高了控制能力，增强了仪器功能。

The paper presents a improving design to solve the problem of SDD model digital conductivity meter. By using bipolar pulse conductance measurement instead of capacity compensative method the design eliminates the measuring error that the parallel capacity in electrode and the polarized capacity bring about in all ranges of measurement. The 8098 single- chip microprocessor is used as controller and processor in the design,so that this electric circuit is simple .the control ability and the function are improved.