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1、Unit 5 A. Text,Testing and Measuring Instruments,New Words and Expressions,instrument 5instrumEnt n. 仪器 faulty 5fC:lti adj. 有缺点的 individual 9indi5vidjuEl adj. 个人的;n. 个人 multimeter 5mQltimitE n. 万用表 milliammeter 7mili5Ami:tE n. 毫安计 mechanical mi5kAnikEl adj. 机械的 pointer 5pCintE n. 指针 scale skeil n. 标
2、度；天平盘，称 screw skru: n. 螺丝 insert in5sE:t vt. 插入，嵌进,lead li:d n. 引线 plug plQg n. 插头 jack dVAk n. 插孔，插座 clip klip n.&v. 夹子；夹住，击打 troubleshoot 5trQbl7 Fut v. 检修，排除故障 appliance E5plaiEns n. 设备，装置， 器具；应用 fuse fju:z n. 保险丝 oscilloscope 5CsilEskEup n. 示波器,cathode 5kAWEud n. 阴极 grid grid n. 栅极 anode 5AnEud
3、n. 阳极 deflection di5flekFEn n. 偏转，偏斜 crystal 5kristEl adj&n. 结晶状的；晶体,Technical Terms,handy multimeter 指针式 万用表 cathode-ray tube (CRT) 阴极射线管 electron gun 电子枪 control grid 控制栅（极） electron beam 电子束 liquid crystal display (LCD) 液晶显示器,Notes,1. Multimeters having only volt and ohm ranges are also called vo
4、lt-ohmmeters. 只具有电压（伏特）和电阻挡（欧姆）的万用表也叫做伏欧表。 having only volt and ohm ranges 为分词短语作定语，修饰前面的名词multimeters。 2. Using a multimeter, you should first place it flat on a table and note if the meter pointer indicates exactly 0 at the extreme left end of the black scale. 使用万用表时，首先你要将万用表平放在桌子上，检查表针是否指向表盘最左端黑色
5、刻度的零位。 Using a multimeter 为分词短语作状语。If 引出宾语从句，作 note 的宾语。,3. If it doesnt read 0, turn the screw on the meter movement slowly until the proper 0 reading is realized. 如没指到零位（如有偏离），可慢慢转动万用表上的螺丝（调整旋钮）直到（指针）归零。 If 引导条件状语从句，主句省略了主语和情态动词 you can。on the meter 为介词短语作定语，修饰 the screw。,4. With a multimeter, we
6、can measure current, voltage, resistance, etc. And we can also troubleshoot appliances, test fuses, measure voltage at a wall outlet, check the wires from your roof antenna, find out whether a wall switch is broken, and perform dozens of other household jobs. 万用表可以用来测量电流、电压、电阻等，也可以检测各种装置的电器故障，比如：检测保
7、险丝，测量墙上插座的电压值，检测房顶上的馈线，查明墙上的开关是否有了毛病，并完成许多其他家用电器的检修工作。 该句为简单句。troubleshoot appliances, test fuses, measure voltage , check the wires, find out whether a wall switch is broken, and perform dozens of .为并列的动宾结构。with a multimeter 为介词短语，作状语，表示方式。,5. You can measure voltage, current, power, and frequency
8、as well; in fact, almost any quantity that involves amplitude and waveform. （你）也可用来测量电压、电流、功率和频率；实际上，它几乎可以测量涉及到振幅和波形的任何一种量。 句中any quantity 与前面的 power, frequency 为并列宾语， thatwaveform 为定语从句，修饰 quantity。,I. Choose the one that best completes each of the following statements according to the text: 1. _ i
9、s / are important in electrical repairing work. A. Testing B. Measuring C. Checking D. All above 2. According to the text, _ is the most common tool in repairing work. A. oscilloscope B. mulitimeter C. screw D. electron gun 3. The multimeter must be put horizontally and the pointer must point to _.
10、A. the left B. the end C. 0 D. range 4. Different _ must be set for different testing and measuring. A. screw B. range switch C. probe D. plug,Exercises,D,B,C,B,5. When testing or measuring you should hold the test probes on the terminals of the _. A. part being checked B. meter C. jacks D. plugs 6.
11、 Oscilloscope is an instrument which can _ the waveform of an electric signal. A. study B. draw C. display D. generate 7. The cathode-ray tube is mainly composed of _parts. A. 2 B. 3 C. 4 D. 5 8. _ greatly decrease the weight and size of the oscilloscopes. A. LCDs B. CRTs C. Screens D. Electron guns
12、,A,C,C,A,II. Try to translate the following phrases into English:,1. 面板 4. 电子原理 2. 表笔 5. 使用手册 3. 读数 6. 电信号,1. face-plate 2. test probe/ test-lead plug 3. reading 4. electronic principle 5. service manual 6. electric signal,B. Reading Oscillator New Words and Expressions generate 5dVenE7reit v. 产生，发生
13、 gigahertz 5dVigEhE:ts n. 千兆赫 spectrum 5spektrEm n. 频谱，光谱 sinusoidal 9sainE5sCidEl adj. 正弦式的 maintain mein5tein v. 维护，维修 exclusively ik5sklu:sivli adv. 唯一, 专有地 carrier 5kriE n. 载体；载波(信号)； 航空母舰,Technical Terms,electromagnetic spectrum 电磁频谱 sinusoidal oscillator 正弦波振荡器 relaxation oscillator 张弛放大器 swit
14、ching circuit 开关电路,Exercises,Decide whether the following statements are true or false: 1. An oscillator can generate frequencies. 2. The signal can be described in two ways according to the waveform they generate. 3. Relaxation oscillators comprise two major parts. 4. A transmitter uses an oscillator to send signals through the air. 5. Oscillators are widely used in our home alliances.,F T F T T,
