对于交流电压测量﹐利用有效值转换电路或精密整流器电路将交流信号转换成直流电压。
For AC voltage measurement, an RMS converter circuit or a precision rectifier circuit convert the AC signal into a DC voltage.
如果输入端的交流电压很大，其一部分信号被整流，于是在被测的直流信号中产生了误差。
If the AC voltage at the input is large, part of this signal is rectified, producing an error in the DC signal being measured.
该系统以可控硅三相桥式全控整流电路构成系统的主电路，采用同步信号为锯齿波的触发电路。
The thyristor triphase-bridge full controllable rectification circuit is taken as main circuit of the system and the trigger circuit with saw-tooth synchronism signal is adopted.
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