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。
Interval: This type lets you search for two successive edges of the same polarity that are separated by a specified interval of time.
间隔触发：这种类型让你去搜寻两个相同极性、被一指定时间间隔分离的连续边界。
The parameters such as frequency, width of each pulse and the interval between successive pulses with inverse polarity can be changed easily in program.
这些参数包括输出脉冲的频率、宽度和不同极性的两个脉冲间隙。
The surface body electrocardiogram(ECG) manifestations of biatrial pacing are that P wave duration shortens, the polarity of P wave changes to negative, PR interval gets shorter correspondingly.
双房同步起搏体表心电图表现为P波时限短、负向或正负双向，PR间期相应缩短。
The surface body electrocardiogram(ECG) manifestations of biatrial pacing are that P wave duration shortens, the polarity of P wave changes to negative, PR interval gets shorter correspondingly.
双房同步起搏体表心电图表现为P波时限短、负向或正负双向，PR间期相应缩短。
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