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电信号采集处理系统一般由模拟多路电子开关、放大器、A/D转换器(包括采样保持器)及数据处理系统组成.多路模拟信号通过模拟电子开关的控制,以分时方式馈至放大器,经A/D转换器变成数字量后进入数据处理系统,例如微型计算机系统.在这种既有模拟电路又有数字电路的系统中,正确的接地是关系到测量精度的关键问题之一.如何接地的问题与采用的放大器及信号源的形式有关.本文仅根据实际工作体会,就电信号采集处理系统中有关接地的几个实用问题进行讨论.
Electrical signal acquisition and processing system generally consists of analog multi-channel electronic switches, amplifiers, A / D converter (including sample and hold) and data processing system.Multiple analog signals through the analog electronic switch control, time-sharing fed to the amplifier , After the A / D converter turns into the digital quantity to enter the data processing system, for example the microcomputer system.In this kind of system which has the analog circuit and the digital circuit, the correct grounding is one of the key issues related to the measurement accuracy The question of how to ground is related to the form of the amplifier and the signal source used.This paper only discusses some practical problems related to grounding in the electrical signal acquisition and processing system based on the actual work experience.