this paper analyzes the measurement error caused by the algorithm, transmission and time delay of the measuring system formed by the electronic transformer, merging unit, switches, optical fiber and digital watt-hour meter (thereafter referred to as watt-hour meter), and designs the calibration method of watt-hour meter, merging unit, digital transmission.%分析由电子互感器、合并单元、交换机、光纤和数字化电能表（此后简称电能表）组成的计量系统中的算法、传输、延时造成的计量误差，并设计了电能表、合并单元、数字传输的校验方法。
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