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本文介绍电位法控制终点的全数字化库仑滴定仪。采用双积分电路技术,使讯号测量与电解滴定交替进行,有效地克服了电极间欧姆电场的相互干扰。并可使临近终点滴定缓慢,利于提高滴定精度。仪器采用具有场效应管为输入级的集成运算放大器作为前置级,提高了仪器的输入阻抗和共模抑制比。用石英谐振器作计时器,提高计时精度。此外,仪器还采用高增益的集成运算放大器组装精密恒流源。
This article describes the fully digitized coulometric titrator for controlling the end of a potential method. Using double integration circuit technology, the signal measurement and electrolytic titration alternately, effectively overcome the mutual interference between the electrodes ohmic electric field. And near the end of the titration can be slow, which will help improve the titration accuracy. The instrument has a FET as the input stage of the integrated operational amplifier as a preamp, improve the instrument’s input impedance and common mode rejection ratio. Quartz resonator as a timer to improve the timing accuracy. In addition, the instrument also incorporates high-gain integrated op amp precision precision current source assembly.