The voltage effective value was figured out by mean square.

再通过其均方计算出电压有效值。

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Use effective value to figure the voltage and the current which ensure higher accuracy. Display in a cycle with prompt to accommodate better content.

电压和电流采用有效值测量，保证数据更准确。采用循环显示及具备提示性显示方式，显示内容多。

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GPS-based phasor measurement unit (PMU) can measure the voltage phasor directly, including the effective value and phase Angle.

基于GPS的相量测量装置(PMU)可以直接测得节点电压相量，包括电压有效值和相角。

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