Electrostatic sparks are considered to be mainly resistive. However, experimental results show that the oscillation frequencies and amplitude attenuation of fitted waveform based on underdamped oscillation have discrepancies comparing with measured voltage waveform if spark gap is replaced by a pure resistance. To study the phenomenon, a simple device was built for strong electrostatic spark discharges of short discharge times. An equivalent discharge model including variable spark resistance and spark inductance was made to simulate the spark discharge. By comparative experiments under different ambient humidity, electrode gaps and charging capacitances, an exponential relationship between spark resistance and spark inductance with discharge time was verified.

静电火花被认为主要是电阻性的。然而，实验结果表明，如果用纯电阻代替火花隙，则基于欠阻尼振荡的拟合波形的振荡频率和幅度衰减与测得的电压波形相比有差异。为了研究该现象，构建了一种简单的装置，可以在短时间内进行强静电火花放电。建立了包括可变的火花阻和火花电感的等效放电模型，以模拟火花放电。通过在不同环境湿度，电极间隙和充电电容下的对比实验，验证了火花电阻和火花电感与放电时间之间的指数关系。