相差式测量仪表零点误差的分析

The analyses of the zero error of phase demodulation instruments

本文在典型的相差式测量仪表基本结构的讨论基础上，分析了其电路系统中两信号通道模拟单元相位特性的差异以及数字单元中转换环节等在时间动态特性上的非一致性，从而揭示了这类仪表零点误差的来源、形成及特点。

Based on the discussion on the typical structure of phase demodulation instruments,this paper gives the analyses of the phase characteristic difference of the analog units in the two signal channels and also gives investigations into the non synchronism of the two conversion components and other units in a digital circuit.From the analyses,the paper brings to light the sources,influence and the characteristics of the zero error of these instruments.This paper is sure to offer a prerequisite basis for the study and development of the on line automatic correction technique for the zero error.