描述
測量交流電壓的原理電路如圖8.11所示。磁電式儀表只能測量直流,如果要測量交流,則必須附有整流元件,即圖中的半導體二極管D1和D2.。二極管值允許一個方向的電流通過,反方向的電流不能通過。被測交流電壓也是加在“+”,“-”兩端。在半正周時,設電流從“+”端流進,經(jīng)二極管D1,部分電流經(jīng)微安表流出。在負半周時,電流直接經(jīng)D2從“+”端流出??梢姡ㄟ^微安表的是半波電流,讀數(shù)應為該電流的平均值。為此,表中有一交流調(diào)整電位器(圖中的600Ω電阻),用來改變表盤刻度;于是,指示讀數(shù)便被折換成正弦電壓的有效值。至于量程的改變,則和測量直流電壓時相同。,,…是倍壓器的電阻
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