In order to confirm the demodulation method of an unknown AC voltmeter, a new method of judging the demodulation method of AC voltage is proposed based on the waveform conversion method and its applicable scope. Connecting Sine wave and cosine wave signal to the AC voltmeter, then adjusting signal amplitude to make the indicating value of voltmeter equal, keeping the two types of signal constant, and measuring their effective values, mean values and peak values based on the indicating value. If their peak values ate equal, the demodulation method is peak detection; if their mean value is the same, the demodulation method is mean value detection; in the event of equal effective values, the demodulation method is effective value detection. Through a specific experiment, the demodulation method is proved to be simple and feasible, so a new way that judging the demodulation of AC voltmeter is supplied.%为了确定某一未知交流电压表的检波方式,根据交流电压表测量电压时的波形换算方法及其适用范围,提出了一种判断交流电压表检波方式的新方法:将正弦波信号和方波信号分别接到所用电压表上,调节信号幅度,使电压表的示值相等,保持这两种信号不变,根据示值得出两种信号的有效值、平均值和峰值并比较其大小.若两者峰值相等,则可判断检波方式为峰值检波;若两者平均值相等,则可判断为均值检波;若两者有效值相等,则可判断为有效值检波.通过实验实例证实了该方法简单可行,进而提供了一种判断交流电压表检波方式的有效方法.
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