一、概述本文介绍的0.1μV前置放大器是我单位研制的SSB—73型双积分数字比率表的一个插件。该放大器的输入阻抗高,对测量回路的影响小,又由于采用了双层浮离屏蔽技术,提高了共态抑制比,因而除可以测量低电平的直流电压和电流外还可以用来测热电偶和应变仪的输出,它能达封的具体技术指标详见附录。设计和制作一个性能良好的放大器的过 I. Overview This article describes the 0.1μV preamplifier is my unit developed SSB-73 double integral digital ratio of a plug-in. The amplifier input impedance is high, the impact on the measurement circuit is small, but also because of the double-layer floating-screen technology to improve the common-mode rejection ratio, so in addition to measuring low-level DC voltage and current can also be used to measure Thermocouple and strain gauge output, it can reach the seal specific technical indicators see appendix. Design and build a good amplifier too