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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。本文的工作为研究在线自动校正技术提供了重要的依据
Based on the discussion of the typical structure of phase difference measuring instrument, this paper analyzes the difference of phase characteristics between two signal channels in the circuit system and the inconsistency in the time dynamics of the conversion steps in the digital unit, The origin, formation and characteristics of zero error of these instruments. The work in this paper provides an important basis for the research of online automatic calibration technology