直流标准电压源是一种高准确度的计量标准仪器。
DC standard voltage source is a kind of metrology standard instrument with high accuracy.
准确获得电网电压的相位角，在电力电子装置设计中有重要的意义。
To obtain the phase of line is important in the design of power electronic equipments.
准确获得电网电压的相位角，在电力电子装置设计中有重要的意义。
To obtain the phase of line is important in the design of power electronic equipments.
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