論述了“100 MHz高速數字存儲示波器”的關鍵技術，著重闡述了系統設計的概念和原理、基于低速器件的高速數據采集技術、基于隨機取樣技術的等效采樣技術的實現。其中，隨機等效采樣的實現采用高分辨力測時擴展器，使等效采樣率達到5 GSPS，時間測量分辨率達到200 ps，實現100 MHz(?3 dB)可重復信號的波形重現，并給出了實際應用中重建的波形圖。The key techniques in the development of digital storage oscilloscope (DSO), a product type project taken by the authors, are discussed, of which the concept and the theory of the system design, the high-speed data acquisition technique based on the devices with lower operation speed, the equivalent sampling technique based on Random sampling are expatiated. The 200 ps time resolution and 5 GSPS equivalent sampling rate are gotten by using large-scale time expander, so the DSO can observe 100 MHz (?3 dB) seasonal signal. The results of experiment and application are presented in the end.