In order to reach the requirement of applying for the multi - objective and multi - parameter measuring , we adopt the distributing computer controlling system which the at89c52 single chip was used as core in the system , also the circuit of signal conditioning and data acquisition and processing are all integrated in the system . we use nixie tube to fullfill the displaying function and adopt high - capacity memory to record the data of production process 同时为适应工厂要求对多目标、多参数进行监测的要求,采用了分布式计算机控制系统,该系统以at89c52单片机为核心,内部集成了信号调理、数据采集与处理、显示等电路并扩展了大容量存储器以保存最近几次生产过程的检测数据,同时还采用了rs485网络总线技术可以方便的将数据传输给上位控制中心。
The former performs simply & clear structure , disadvantage is not convenient enough ; the latter is the other way round . smart transducer interface module mainly contain : transducer array module 、 signal conditioning module 、 multicenter data acquisition 、 teds and transducer independent interface ( tii ) . to build system integration , soc ad c812 are used here 本模块协议的研究发掘了ieee1451国际标准中的精华电子数据表格,软件部分的设计为ieee1451网络化智能传感器的进一步研究奠定了基础,为开发各种标准化的ieee1451智能传感器模块提供了范例。
The designed signal conditioning module can filter interference and noise of the receiving signal , and then acquire useful information . so the output signal can meet the need of the voltage level needed by the adc . the phase consistency can reach the demand by the reasonable design 信号调理分系统的设计和实现,从水声信道的特点出发,通过设计的模拟预处理模块滤除接收的弱信号中的各种干扰和噪声,提取出有用的声信息,同时给予一定的放大,使输出信号达到a d转换的电平要求。
In hardware designing , the feasibility to use a / d acquisition board , signal conditioning board and the relay output board which are more professional at present to construct the hardware of the computer control system was explored , the algorithm pid was used to advance the respond to error and stability of the whole system , through selecting proper a / d , d / a , di / do board cards , a special computer control system was constructed . in software designing , the language borland c + + was 在硬件设计上,探索采用目前较为专业化的a / d转换卡、信号调理板和继电器输出板构成计算机控制系统硬件结构的可行性,并采用pid控制以提高系统对误差的响应和整个系统的稳定性,通过选用适当的a / d 、 d / a 、 di / do等板卡,构成一个很有特色的计算机控制系统。
They are voltage to digit data converting circuit board , current to digit data converting circuit board and digit data input / output circuit board . these circuit boards are used to acquire the main running parameter of hev experimental bed and to control the output of alarm message . in order to simplify the wire connection and signal conditioning , three piece of interface circuit boards correspondence to the three data acquisition circuit boards are equipped , and a wire connection box is also designed to contain them 本文监控系统的硬件以一台工业控制pc机为核心并根据采集信号的性质配置了电压-数字量转换板、电流-数字量转换板及数字量输出输出板,对hev运行系统的主要运行参数进行采集并进行报警控制;为方便接线和信号调理,配备了与采集板对应的接线和调理接口板以及接线盒。
The paper introduces these technologies as fellows : ( 1 ) the overview of virtual instrument ( 2 ) pci bus protocols and specifications ( 3 ) hardware section analogue signal conditioning circuit high speed a / d conversion circuit fpga circuit pci bus interfacing circuit ( 4 ) software section visual c + + programing hardware driver programing vhdl programing ( 5 ) the method and result of system test 论文从以下几个方面进行了阐述: ( 1 )虚拟仪器概述( 2 ) pci的协议规范( 3 )硬件电路设计模拟信号调理电路设计高速a d转换电路设计fpga电路设计pci接口设计( 4 )软件设计visualc + +编程设计底层驱动软件编写设计vhdl编程设计( 5 )系统调试方法和结果
Based on this scheme , the control system architecture is designed . based on this system ’ s necessary , the signal conditioning interface box is designed , it is used in the conditioning of sensor and the design of drive circuit , the software of controller is also developed , finally , the performance index of controller is validated by a closed - loop simulation test system with aero - engine model and digital controller 根据此方案,确定了仿真平台中控制系统的体系结构,根据系统的需要,设计了信号调理接口机箱,实现了对传感器信号的调理及驱动电路的设计,并进行控制器软件的开发,最后利用发动机数学模型和数字电子控制器组成闭环仿真环境,以验证控制器的各种性能指标。
This system combines intelligent measuring instrument with eda and asic design technology , computer hardware and software technology , digital signal processing together . the system hardware includes high - speed data acquisition circuits , analogue signal conditioning circuit , a / d conversion ; fpga circuit with controlling and processing functions and pci interfacing 系统硬件部分主要有模拟信号调理电路和高速a d转换芯片组成的数字采集电路; fpga组成的控制和数字信号处理电路; pci接口芯片组成的接口电路。
Based on iec standards , the methods of designing square demodulator , bandpass - weighted filter , and smoothing filter are presented . besides , the signal conditioning circuits and online statistical analysis methods of instantaneous flicker value are given . matlab simulink is also used to simulate the measuring process of voltage fluctuation and flcker 基于iec标准要求,设计了实现数字式电压闪变测量的平方解调器、带通加权滤波器、平滑滤波器等各环节,给出了信号调理电路和瞬时闪变值在线统计分析方法,并应用matlab系统仿真工具simulink对电压波动和闪变测量全过程进行了数字化仿真。
The main contents to be studied and solved are shown as follows : designing scheme of the error compensation system , studying and designing the signal conditioning circuit , designing the data - acquisition circuit , designing and realizing the max1457 software development system . the compensating circuit is designed in virtue of the signal conditioning chip max1457 as its core . the data - acquisition circuit is designed in virtue 硬件方面,根据总体方案设计了以信号调理芯片max1457为核心的补偿电路;以max1401为核心的数据采集电路,用来采集传感器的电桥电压和max1457输出电压;设计了max1457电源电路, max1457的电源电压是失调dac和灵敏度dac的参考电压,采用了ad586给max1457提供精密5v电源电压。
In electronics, signal conditioning means manipulating an analog signal in such a way that it meets the requirements of the next stage for further processing. Most common use is in analog-to-digital converters.