This added voltage is mainly power line frequency and its effect on the voltmeter reading will depend upon the normal-mode rejection capability of the meter.
这个相加的电压主要为电源频率的信号，其对于电压表读数的影响决定于电压表的串模抑制能力。
The circuit shown in Figure 25 is the heart of an average reading, rms calibrated AC voltmeter.
图25是一个平均值输出，有效值刻度的交流电压表头放大电路。
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