Phase lock and multiple frequency circuit diminishes the influence from frequency fluctuation of electric net; in addition, multiple channels simultaneous sampling, high-precision circuit decreases the error caused from the sampling tache.
用锁相倍频跟踪电路来提供采样频率，以减少频率波动的影响，用多路同采的高精度采样电路来减少采样环节引入的误差。
参考来源 - 绝缘在线监测系统中tgδ在线监测的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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