The polarity of impulse voltage and the polarity of insulator surface electric charge can affect the corona initial time of insulator, the change time - interval and the corona current.

外拖冲击电压的极性与绝缘子表面电荷极性是否相同会影响绝缘子的电晕起始时刻、由流注向先导的转变时间间隔和流注电晕电流。

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To be observed on same field in same time, telluric observation is interfered by electric current in measuring the apparent resistivity, and the data are changed to square impulse.

地电场和电阻率同场地观测时，电阻率观测会干扰地电场的观测数据发生大幅度变化。

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Used in all kinds of direct current, impulse, high frequency and heavy current occasions, widely used in electric appliance that require high frequency, heavy current and high stability.

各种直流，脉动，高频较大电流场合，广泛应用于要求高频率，高电流，高稳定性的电器。

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