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数字源是标准源中的核心环节，本文提出了数字源中Ｄ／Ａ转换器位数Ｓ的选择依据，并讨论了数字合成正弦波信号的采样点数Ｎ与相对复原误差ｒｍ间的关系。
The digital source is the core of the standard source. This paper presents the choice of the number of bits S of the D / A converter in the digital source, and discusses the relationship between the sampling points N and the relative recovery error rm of the digitally synthesized sine wave signal.