Microwave power density (microwave field strength) is an important parameter in field strength metrology. Nowadays science and technology are improved rapidly, communication, radar, computer and microwave devices all have intimate relationship with this microwave parameter. It exists around us all the time and severely affects the safety of our lives and equipments. Therefore, it’s imminent ...

From the 70s in the last century, a new kind of oscilloscope—– DSO(Digital Storage Oscilloscope) has being coming into view and is now advancing rapidly following the maturity of the theory of digital signal processing and VLSI’s flying along with micro-processors technology, expecially high speed A/D converters and RAMs.This disseration introduces the application of interpolatio...

This paper mainly introduces a practical frequency measurement scheme which based on phase coincidence detection theory. And depending on it, this frequency-measuring meter overcomes the±1 word count error and achieves high measurement precision on a wide frequency rage. Its principle has spread both national and abroad.In this frequency meter, the realization of phase coincidence detecting ...

In recent years, high voltage direct current system (HVDC) is rapidly developed, but harmonic pollution is produced and becomes badly, harmonic measurement by true is the precondition and sticking point of restraining harmonic. At present, measure instrument in power system is almost designed to use sine for 50Hz frequency. When signal contains harmonic, the error of measurement result will be...

This paper around multi-purpose power meter design requirements, from two major aspects—the system hardware design and system software design, stresses the ammeter’s real-time subsection detection and measurement、multi-function and network. The purpose is to enable ammeter measure respectively and accurately in both case—ultra-low-load and normal load always, in order to achieve the f...

With the development of radio technology, test and measurement on microwave or RF become more and more important. Specifications of all kinds of electronic instruments will directly affect the performance of related electronic equipments and systems, and demands on each specification of RF signals become more and more exact for the development of electro-information technology, which brings a...

The high voltage power cable is a basic equipment in the electricity transmitting. As the wide application of the XLPE Power Cable and ultra high voltage, people give more and more attention to the cables\’ security and reliability. The semi-conductive shield is an important ingredient of the power cables which directly affect the runtime and reliability.The measurement of resistivity of...

Electric parameter is an important support for the automatic monitoring, control and protection of the power systems. The prompt and accurate measurement of electric parameters is of great significance for realizing the automation of the power network dispatch as well as assuring the safe and economical operation of the power network. The increasingly severe pollution of the electric environm...

With the development of frequency synthesis theory and high speed LSI (Large Scale Integration), the signal generator, a sort of electronic equipment, has been widely applied in many fields such as communication, detection and navigation. Specially, in the field of high voltage power system, the standard signal source, which simulates the harmonic of electric power lines, is needed to calibrat...

With the development of computer and microelectronics, Spectrum analyzing based on Digital Signal Process (DSP) has been applied in all kinds of fields, and it acts as an important role. But in teaching procession, the effect of teaching was affected because we could not show the spectrum of signal directly and could not afford the expensive spectrum analyzer.Based on above phenomenon, We desi...