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为了研究观测自然电位、地应力的低频、直流仪表在大震前出现突跳、抖动,基值变化速率增加的原因,我们对一些常用的低频直流仪表进行了不同波形的频响测试,并且开展了一些观测对比实验。结果表明低频直流仪表除了可以测量直流及慢变化的电信号外,一定频段内的电磁波和不同波形的电信号在低频直流仪表上也有不同程度的反映,以突跳、抖动等形式出现。
In order to study the observation natural potential, low-frequency ground stress, DC instrument before the earthquake kicking, jitter, the base value of the rate of change reasons, we have some commonly used low-frequency DC instrument frequency response of different waveforms, and carry out Some observation contrast experiment. The results show that in addition to the low frequency DC meter can measure the DC and slow changes in the electrical signal, a certain frequency band of electromagnetic waves and different waveforms of electrical signals in the low frequency DC meter also have different degrees of reflection, Kick, jitter and other forms.