一、概述 电子电位差计和平衡电桥用的伺服放大器是自动平衡记录仪的核心,它的作用是将测量来的微小偏差信号放大,来驱动平衡或执行机构,以便实现系统的自动平衡。随着硅器件工艺的进步,在伺服放大器中硅器件取代了锗晶体管,从而大大提高了晶体管伺服放大器温度性能和可靠性。目前我国大量 First, an overview of electronic potentiometer and balance bridge servo amplifier is the core of automatic balance recorder, its role is to measure the small deviation of the signal amplification, to drive the balance or the implementing agencies in order to achieve the system automatically balance. With advances in silicon device technology, silicon devices in the servo amplifier replaced the germanium transistor, thereby greatly improving the transistor servo amplifier temperature performance and reliability. At present, a large number of our country