一、任务的提出随着示渡器频带宽度的扩大,如何能够正确地进行对示波器本身的瞬态和稳态响应特性的测量,在测试方法和测试设备问题上,关键问题,就是要解决被测示波器与测试信号源间的阻抗匹配要在整个带宽范围内保持良好。示波器的输入端,在高频范围内,呈现容性阻抗,并随频率上升而下降,因此,信号源经同轴传输线将测试信号送到示波器输入端时,就必然 First, the task presented With the extension of the bandwidth of the display device, how to correctly carry out the oscilloscope itself transient and steady-state response characteristics of the measurement methods and test equipment in the test, the key issue is to solve the problem of being Impedance matching between the oscilloscope and the test source should be well maintained over the entire bandwidth. Oscilloscope input, in the high frequency range, showing capacitive impedance, and as the frequency increases and decreases, so the signal source through the coaxial transmission line to the oscilloscope test signal input, it is inevitable