关键词：电量变送器，交流采样，傅立叶算法，单片机，频率测量
ABSTRACT
Using traditional methods when measuring the exchange of electrical signals, often used magnetic-electric, electric, induction, such as conventional analog instrumentation, and now are generally based on the use of electronic technology of the transmitter, the exchange will be converted into electrical signals DC signal through modulus Conversion, then measured by the computer. With the development of micro-electronics technology, computer exchange of signals directly to the sample survey has industry people into practical stage, so not only reduce the volume of equipment, lower costs, reduce the time delay and improve the measurement accuracy and precision, But also for electricity production and use in the management of scheduling the full realization of automation, to achieve unattended, few people on duty to create favorable conditions. So exchange sampling, to design a reasonable hardware circuit and the preparation of a highly efficient testing program is worthy of further exploration and study.
This thesis examines the various algorithms that are currently applied to electrical quantity transducer. It is identifies and proposes a magnitude algorithm, and frequency measurement algorithm, Both of which are based on the Fourier algorithm. The proposed magnitude algorithm can eliminate the decaying DC component, and the proposed frequency measurement algorithm can produce a high accurate output the new magnitude algorithm dose not require the decaying constant τ to be known in advance. The frequency measurement algorithm can accurately track the system frequency by adjusting the amendatory coefficient in real time according to the error of the original Fourier frequency measurement algorithm, The thesis introduce in detail the hardware structure and software programming of electrical quantity transducer, In combination with algorithm and based on single chip microcomputer-80C196KC.It provides new solutions for the handling of the result of A/D sampling and the square root algorithm. While the reliability of transducer is improved in both hardware and software.
KEY WORDS：electrical quantity transducer, AC sampling, Fourier algorithm, single chip microcomputer, frequency
