电子信息工程专业英语29 Oscilloscopes.ppt

《电子信息工程专业英语教程》 Lesson 29 Oscilloscopes 《电子信息工程专业英语教程》任治刚 主编 电子工业出版社 Lesson 29 Oscilloscopes Terminology CRT: Cathode Ray Tube　　 阴极射线管 Transducer 传感器，变频器，变换器 Fundamental frequency　　　 基频 Terminology sonic boom　　　 声爆 single-shot　　　 单脉冲 Raster 光栅 Nature moves in the form of a sine wave Oscilloscopes enable scientists, engineers, technicians, educators and others to “see” events that change over time. Oscilloscopes are indispensable tools for anyone designing, manufacturing or repairing electronic equipment. The possibilities are endless. analog oscilloscope digital oscilloscope digital storage oscilloscopes (DSOs) digital phosphor oscilloscopes (DPOs) digital sampling oscilloscopes An analog oscilloscope works by applying the measured signal voltage directly to the vertical axis of an electron beam that moves from left to right across the oscilloscope screen CRT probe attenuator vertical deflection plates trigger system Horizontal sweep focus and intensity controls DSO display typically relies on a raster-type screen rather than luminous phosphor. DSOs allow you to capture and view events that may happen only once–known as transients. DSOs typically have no real-time intensity grading DSO uses a serial-processing architecture (see Figure 10.5) to capture, display and analyze signals DPO offers a new approach to oscilloscope architecture. This architecture enables a DPO to deliver unique acquisition and display capabilities to accurately reconstruct a signal. DPO employs a parallel-processing architecture to perform these functions, as shown in Figure 10.6. The DPO architecture dedicates unique ASIC hardware to acquire waveform images, delivering high waveform capture rates that result in a higher level of signal visualization. A digital sampling oscilloscope is an ideal tool for accurately capturing signals whose frequency components are much higher than the oscilloscope’s sample rate. This oscilloscope is capable of measuring signals of up to an ord