An open loop amplifier which has three poles was built,its open loop voltage gain corresponding to-180°phase difference was found from the frequency respond which was got from the AC Analysis in Multisim.The extent of feedback coefficient was calculated according to the stability working condition,the feedback resistance of voltage series negative feedback was calculated,then feedback amplifier was built.Changing feedback resistance,observing wave forms of input and output using oscilloscope and doing Fourier analysis using Fourier Analysis in Multisim.The result shows that the wave of oscillation is mainly composed of two components:one is the amplification of input,another comes from self oscillation,whose frequency is equal to the theory analysis,apart from that there are still some other small amplitude harmonics.The process of the start of oscillation,the decrease of the amplitude and in the end the stop of oscillation with the increase of feedback resistance can also be watched.

With the rapid development of computer technology and internet,traditional teaching and management method can't meet the demands,remote electrotechnical and electronic experiment teaching and management workbench is designed. This workbench is composed of many function modules.logon ,on this workbench,equipment management,virtual experiment and experiment reservation can be done,all kinds of relative information can be achieved and experiment teaching materials can be downloaded.The design concepts and functions of some main modules such as equipment management,virtual experiment,experiment reservation are introduced in this paper,development environment and technologies are stated,different layer management models are proposed.

Reactive power compensation is meaningful for the stable and economic running of the electric power system. As the development of electrical and electronics technology and the instantaneous reactive power theory, an advanced static Var generator (SVG) which adopts self-adaptive phase AC circuit appears. A new SVG used in low voltage distribution system is designed in this paper. It mainly introduced the software of this system, including: 1) PWM pulse generator; 2) Design of the grid frequency tracing module; 3) A/D conversion module.

The terminal design of a data acquisition system based on GPRS is designed in this paper. It works out the hardware design of GPRS terminal equipment, including the minimum system design based on the Samsung ARM7-core microcontroller S3C44B0X, and the hardware design adding the GPRS engine MC35i produced by Siemens and RS485 interface to the minimum system. According to dial-up procedure, describes how to design the MC35i dial-up program. Here introduces some important subsets of AT command sets, and also describes how to use them to dial up MC35i; analyzes the principle of the point-to-point protocol, and also demonstrates how to establish the wireless link to GPRS by practical example.

Practice is a key teaching link in training qualified talents in universities,which plays a very important role in enhancing student's ability of independent-practice and innovative mind and synthetic quality.The article introduces simply effective measures of enhancing student's ability of independent-practice and synthetic quality during teaching and experiment reform of electrical and electronics experimental teaching in Beijing University of Chemical Technology in recent years.

The intelligent manipulator is installed on the mobile platform. This configuration make the manipulator possess of almost infinite workspace and the high kinetic redundancy and have the function of movement and manipulation. From this point of view, itpsilas better than the mobile robot and traditional manipulator. This paper designs the mobile control scheme of intelligent manipulator based on digital PID, and the control improvement scheme of the system when the mobility of the platform is interfered. Also, the paper studies the realization of the control method of digital PID and proposes a simple intelligent control system of the manipulator.

This paper introduced the reformation and practice for the experimental teaching center of Electrotechnics and Electronics in Beijing University of Chemical Technology.The reformation is focused on the composition between teaching and research.The target is to train creative,multiskilled talents in the field of such important subjects as automatics and process control for chemical technology and engineering.The practice can improve the quality for teaching contents and methodology.Great achievements are got with such reformation and pratice.

In this paper,the author mainly introduces the design of streaming current detector and controller based on embedded system microprocessor LPC2210 of PHILIPS.And expounds the development process of FIR filter and the emulation system.The result indicates the research of this new instrument have improved the ordinary Streaming Current Detector on the function,reliability,expansibility,prac ticability and stability.

The basic structure and operational principle of CF card are introduced. The interface between SPCE061A and CF card and system software are designed, in accordance with FAT16 format the file system based on SPCE061A and CF card is implemented. The system is used in data storage of vehicle driving data recorder.

介绍了一种新型监测换热器控制装置,它能够视用户需要,同时对多个监测换热器的进水流量、出入口温度、浓缩倍数、污垢热阻等参数进行监测,并对进水流量和介质温度实现自动控制。该装置的突出特点是可通过网络实现远程显示和操作。

ASK module is integrated with MCU, which is able to detect signals and deliver control signals. This functional module is put into a detector and a controller for building a wireless communication network and might be used in an Intelligent Building's fireproofing and security system. The collision question and low voltage warning were considered and resolved. It is found that the system can work steadily and meet the requirement of users.

ASK module is integrated with MCU to finish detecting signal and outputting control. This functional module is put into detector and controller to building wireless communication network and being used in Intelligent Building's security system Collision question is considered and resolved. So this system can work steadily and meet the requirement of user.