为修正高电压测量探头寄生参数对测量ns脉冲波形的影响, 对探头的数字补偿方法进行了研究。利用对低电压标定所得标准参考信号和探头信号做傅里叶变换, 得到其各自的频谱密度, 然后通过相除, 得到探头灵敏度与频率的关系和信号相位与频率的关系。在实测时, 再对测得信号做傅里叶变换, 将得到的频谱密度乘以探头灵敏度及信号相位对频率的函数, 通过傅里叶逆变换重建出待测信号。通过不同信号进行波形重建实验证明, 此方法能够在短时间内很好地修正高电压测量探头寄生参数对ns脉冲波形的畸变。

In order to correct the effect of the atrociousness parameter of monitor on waveform, we made Fourier transform of the signals of source and monitor and got the function of monitor sensitivity and phase with frequency using the signal spectrum of source dividing the signal spectrum of monitor. In measurement, we made Fourier transform of the signal of monitor, multiplied by the function of monitor sensitivity and phase with frequency, then reconstructed the waveform with Fourier reverse transform. The method transforms the time domain signals into frequency domain signals, and then reconstructs the signal with a coefficient determined from calibration. Theoretically, the method can improve the monitor’s spectrum as the standard monitor. It is proved with experiment that this method can reduce the effect of the atrociousness parameter frequency response of monitor on waveform significantly.