微机测控系统设计中需要注意的几个问题

Questions on design of measuring and controlling system by a microcomputer

从微机测控系统设计的实际出发,针对传感器的输出端经常产生较大的干扰噪声以及模拟多路开关MUX在系统中出现的共模电压VCM,提出了干扰抑制和测量放大器本身的共模能力的发挥等措施;采样周期的确定时不仅满足采样定理要求而且还要注意到执行元件的动作速度以及计算机精度限制始终使iieTT为零。积分部分不能继续起消除残差作用,残差被保留后会造成超调量和动态过程减慢等现象。

The article deals with several measures to restrain interference and make the best of common-mode ability of instrument on the basis of practice of Microcomputer measuring and controlling system. Because the output of sensor often produces intense noise interference and Analog Multi-plexer(Mux) often turns up common-mode voltage(Vcm).When sampling period is determined, it not only complies with sampling theorem, but also relates the action speed of execution component. The computer precision is so good that iieTTequals to zero. The part of calculus can not go on eliminating remanent static-error that can give rise to such phenomena as ultra-adjustment quantity, slowing down dynamic process, and so on.