It introduces the methods of alternating current sampling for the power parameter of sing chip computer in fer- roalloys furnace.

Test methods for AC sampling equipment by using middleware technique;

Evaluation of uncertainty about indication error of AC sampling apparatus;

AC sampling anti-interference design based on inner A/D of DSP56 F807;

the AC-sampling and the DC-sampling method.

AC-sampling and processing circuit applied to different kind of transformers have been designed and analyzed accordingly.

This paper introduces the principle and characteristic of the air-core coil current transformer,designs AC-sampling and processing circuit,and introduces the process of software detail.

In this paper, three bandpass digital quadrature sampling are discussed, based on discrete lowpass filter, Hil-bert transform and discrete Fourier transform.

Signals can be sampled with A/D converter module embedded PIC single chip and a quadrature sampling approach is adopted to process data and measure RLC parameter.

A high-efficiency algorithm realizing quadrature sampling and pulse compression through frequency domain is presented to obviously reduce the amount of computation and improve the speed and real-time performance of radar signal processing.