It is an important tool that detects and records kinds of data in the industrial process. The recorder of the paper used S3C44B0X of ARM7TDMI as the CPU, and the uClinux was used as embedded system, and has design the USB interface for it. The paper is mainly about the use of the embedded system in the digital recorder and the method to design the driver in the embedded system. 1. Chose the ha...

It creates the model of layer soil by using the CDEGS software, analyses the resistance error which is measured by traditional three-poles way, measures the grounding grids resistance and soil resistance rate of Hejin Power Plant, creates the electromagnetic model of layer soil and grounding grids model of Hejin Power Plant, calculates the step voltage > touch voltage N voltage distribution of...

With the development of electric power system and the progress of agriculture and society in our country, the electric locomotive era has brought lots of convenience for us. For making the electric locomotive serve us better, we should analyse and discuss the security of the electric locomotive. It\’s known that the electric locomotive\’s energy is provided by catenary and the cat...

Virtual instrument(VI for short) is a new kind of electronic instrument with electronic measure technology deeply combined with computer technology and in a good developed foreground, and is widely used in every field of science technology. The realization of Virtual Digital Storage Oscilloscope(VDSO) based on USB2.0 is presented in detail in the paper,including hardware design and simulation...

With the development of times, The measuring instrument is being developed in the direction of the virtual instrument(VI), the virtual oscillograph has wide use especially, it can not noly realize the function of the traditional oscillograph , but also store , reproduce , analyse , deal with the wave form etc.This thesis has designed the circuit of virtual oscillograph acquisition and USB comm...

The temporal behavior of photoelectrons generated by 35ps laser pulses in cubic silver halide emulsion doped with formate ions has been measured with the microwave absorption and dielectric spectrum detection technique, and the time-resolved spectra of photoelectrons in emulsion with different doping conditions were detected. The hole-trap effect of formate ions and the relationship between p...

With the fast development of civil economy,power loads in cities become greater by and by,as high-voltage transmission and transfer devices provide power for cities,electromagnetic field they produce also brings lots of electromagnetic pollutions,which not only affect normal working of electrical devices around them,but also endanger people’s health and security.So the influence and restrai...

A new method of measuring conductivity for liquids based on cross-conductivity technique was presented. For this purpose, a unique design of conductivity cell with four electrodes and derivation the relationship of the cell constant with its capacitances and determine the cell constant to avoiding the difficulties for the determination of cell constant. This paper also briefly introduce the c...

It is very significant that accurate and quick measurement of the electric power parameter for realizing the automation of power network dispatching and guaranteeing the safe operation of power network. With the development of modern power electronic technology, nonlinear loads are extensively applied in production and life.Their nonlinearity, impact and imbalance make power quality worse and...

A power quality surveillance system is developed in this thesis. At present, our country power quality national standard was chiefly stipulated six quotas: frequency, harmonic and voltage deviation, three-phase imbalance, the voltage fluctuation and flicker, temporary power quality.Based on the analysis of the similar productions of other countries and manufacturers, we put forward our design...