With the progress of science and technology, electronic type electric energy meter is widely used in electric energy metering and charging in China, especially in rural power network reform, investment, electronic type electric energy meter with its linearity, stability is good, the power consumption of small, voltage and frequency response speed, high measurement precision, to further improve the market share, but how to test electronic type electric energy meter, but has been puzzling the test technical staff, according to the practical experience on the above problem undertakes a few discuss. This paper analyzes the electronic type electric energy meter principle, characteristics, focus on the research of the electric energy meter calibration method, the electronic type electric energy meter calibrating idea and train of thought.

Ohm is the basic unit of electric parameter. Its quantity transferable system is achieved by the ohm resistor. The quality of the ohm resistor is directly related to the accuracy and reliability of quantity transmission system. Ohm resistor can be divided into DC resistor and AC resistor to use. With the development of modern electronic technology, the AC resistor attracts more attention. The design and manufacture of AC resistor has always been difficult which involves cross-integration of the mechanics, electromagnetic and material science, the design effect of most products is not ideal. The technical features, design principles and factors in manufacturing are present in this paper for AC resistor manufacture and test units.

EEG contains a wealth of physiological, psychological and pathological information, EEG signal analysis and processing are either in clinical of some brain disease diagnosis and treatment, or in the cognitive science research fields are very important. According to the basic characteristics of EEG signal, discusses the EEG signal acquisition principle, method and the design train of thought. Proposed pre-amplification system design, after prestage processing of EEG signals, can be seen in the EEG signals transform trend, coupled with the follow-up processing, can get the clear stability of EEG signal, and has good application value.

In recent years, with the rapid development of electric power, the construction of a large number of substation, electrical measuring instrument and device is also increasing, accordingly, testing and calibration work is growing. The traditional calibration method has been unable to meet the actual needs of work. Combining with the practical work, and put forward a new automatic calibrating method, this paper introduces the electrical measuring instrument verification device of automatic calibration system of the working principle and system structure, and illustrates the system application.

With the coming of information society, the development of optical communication technology is highlighted particularly, modern communication technology has become the most important part of. This paper introduces the prospects of fiber optic communication, principle and technical features. In the system design, detailed introduced the fiber optic communication technology as the core, for voice transmission system in which audio signals are generated, then the road filter, audio amplifier, data acquisition unit circuit design. In this paper including system each composition unit selection as well as the ultimate design method, and make the circuit debugging the system summary.