In the view of signal processing, harmonic, DC offset, frequency fluctuation and random noise are the main factors that infect tanδ measurement.
从信号处理的角度看,谐波、直流漂移、频率波动、随机干扰是影响 tanδ准确测量的主要因素。
参考来源 - 电容型电力设备tanδ在线监测技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
AC current or voltage source. DC offset can be specified.
交流电流源或电压源。可指定直流偏移。
The paper also uses the dc offset to implement the voltage measurement.
再用增加直流偏移量解决实际电路中遇到的电压测量问题。
As a quick experiment you could use Audacity with some filter to generate a signal with a DC offset.
作为一个简单的实验可以用大胆一些滤波器来产生信号的直流偏移。
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