In order to ensure the electrical network work safely and grasp its running status, the parameters of electrical network should be measured exactly. EPMI (Electrical Parameter Measuring Instrument) is just an instrument which can measure the electrical parameters. The paper introduces the development status and background of EPMI overall and expounds the measuring principle of voltage, current...

With the increasing development of the market reform in Electric Power System, the high accuracy of electrical measurement is needed. There exits a compound error problem in the electrical measurement , which is composed of PT synthetic error, CT synthetic error, electrical energy measurement error and secondary potential of PT. Among the above 4 errors, secondary potential of PT is obvio...

With the advance of 1C technology, IC\’s complexity and performance grow rapidly, which give much challenge to the traditional methods or techniques.This paper presents a new test method-at-speed current testing based on analyzing the theories, characteristics and shortcomings of quiescent power supply current testing and dynamic current testing.The method of at-speed current testing com...

High frequency harmonic in electric power network can pollute the network, control high frequency harmonic is an important research problem in electrical system function. Detect and measure harmonic is needed to control harmonic. Fast Fourier Transform (FFT) is an effective method to detect harmonic. The paper mainly research some relevant problems of using SCM language to realize FFT algorith...

Signal analysis and processing involves almost all the engineering and technical fields. As a realization of signal analysis technology, Dynamic signal analyzer is used widely in computer manufacturing, automotive, aerospace, military, electronics, telecommunications and other high-tech areas for product quality testing, vibration control and test diagnosis.Presently, most available products ...

According to the principle of the electric-magnetic check-measure, this thesis puts forward a new technique and method capable of measuring the dynamic parameters of a rotating component such as angle speed, shearing strain and bending strain with the utilization of magnetic marks. This thesis establishes the mathematical models of measuring angle strain and bending strain, develops the functi...

This paper designs a new type of handheld LCR meter for electronic measurements. This meter can measure resistance R, capacitance C, inductance L and other related arguments.This meter is composed of signal generate circuit, half-bridge measurement circuit, phase-sensitive detector circuit, A/D converter, microprocessor, keyboard array, LCD and so on. In the design of standard signal generato...

With the improving of our national economy, kinds of industry production demand high power quality. Getting the power quality parameters of power system in time is very important to industry production. At present, our country\’s power quality national standard was chiefly stipulated five quotas: frequency, harmonic and voltage fluctuation, unbalance and the voltage fluctuation and flic...

With the further advance of computer technology, automatic identifying technique has been extensively applied to many fields in recent years. As image is the most effective form for men to obtain and communicate information, image identifying technique, part of automatic identifying technology , with its rapid development in the last 20 years, has been known to be an important way to further ...

Today, there is big distance between the technology of the safety tester of China and that of the abroad, such as America, Japan and Taiwan of China. The electrical manufactures have tremendous demands to safety testers, especially the testers with high accuracy and high speed, but the price of the abroad tester is very expensive, and the service can not be provided in time. So there are prom...