中文摘要：

交流电流比较仪能提供精确的电流比例，本征地适合四端钮阻抗的测量。本文概述交流电流比较仪的发展状况及其基本原理，介绍交流电流比较仪电桥在四端钮阻抗测量中的应用，指出音频电流比较仪电桥将成为未来研究的主要方向，并重点讨论音频交流电流比较仪电桥在容性误差补偿、灵敏度以及比例校验等几方面的关键问题。

英文摘要：

Alternating Current Comparator （ACC） is very suitable for measuring four-terminal impendence for its accurate current ratio. The development and basic principle of ACC are presented and the application of ACC on scaling four-terminal impendence is summarized in detail. Then, this paper indicates that the ACC-bridge for audio frequency may be further researched. Some key problems of audio frequency ACC-bridge, such as compensation of the capacitance error, sensitivity, and calibration method for ratio, are mainly discussed.