广东海洋大学电子信息工程专业英语(电子仪器).ppt

Specific English for Electronic Information Engineering Teacher：张培珍 Guangdong Ocean University Lesson 4: Electronic instruments Index Pre-reading 4.1 Oscilloscope 4.2 Analog oscilloscope 4.3 Digital oscilloscope 4.4 Multimeter 4.5 Signal generator Pre-reading 1 2 3 difference between analog and digital oscilloscope usage of multimeter Usage of signal generator Read the lesson, paying attention to the following questions. 4.1 Oscilloscope An important electronic test and measuring instruments; Observation of an electrical waveform. Oscilloscope Two types: analog and digital oscilloscope. Words and expressions Oscilloscope：示波器 Instrument ：仪器 Trouble shoot：故障查找 Signal monitoring ：信号监控 Manufacturing and production-line testing 制造和生产线测试 Waveform：波形 Analog oscilloscope ：模拟示波器 Digital oscilloscope ：数字示波器 4.2 Analog oscilloscope Graph-displaying device; The heart of oscilloscope is cathode-ray tube(consists of base, electron gun, bulb and screen) Structure of electron gun Cathode, control grid, anode, two sets of deflection plate( horizontal and vertical direction) Words and expressions Analog oscilloscope: 模拟示波器 Graph-display device： 图形显示仪器 Cathode-ray：阴极射线 Electron gun：电子枪 Screen：显示屏 Control grid：控制栅 Electron beam：电子束 Deflection plate：偏转板 Horizontal：水平的 Vertical：垂直的 Waveform (1) Graph changes over time; (2) Horizontal axis represents time(including period, pulse width, frequency); (3) Vertical axis represents voltage (by counting the number of cm from peak to peak, and mutiplyed by volt/cm); Time measurement (1) using horizontal scale; (2) including period, pulse width, frequency; (3) frequency is the reciprocal of the period; Words and expressions Horizontal axis:水平轴 Vertical axis：垂直轴 Centimeter：厘米 Peak ：峰值 Multiplying：乘 Scale ：尺度 Period：周期 Pulse width：脉冲宽度 Frequency：频率 Reciprocal：倒数 Using analog oscilloscope Adjust three basic settings to accommodate an incoming signal: (1) The attenuation and amplification：volt/div; (2) The time base: second/div; (3)Trigger l