Unit 5 How to Use a Tester

New Words

design v. 设计 measure v. 测量DC (Direct Current) 直流电 AC (Alternate current) 交流电voltage n. 电压 resistance n. 电阻 conductivity n. 导电性 diode n. 二极管multimeter n. 多用表 illustrate v. 示例function n. 功能 mark .n 标记switch n. 开关 display n. 显示（值） test leads 表笔 circuit n. 电路 power n. 电源 cathode n. 阴极

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Unit 1 What is a Web Digital Camera

• Text • Translation of the Text• Notes• Exercises• Oral Practices

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This instrument is designed to use for measuring AC voltages, measuring AC voltages, measuring resistance, conductivity test and diode test. It is called a digital multi-meter. The following is illustrating the operation. |. Measuring DC voltages1. Set the function switch to DCV.2. Connect the test leads to the circuit to be measured.3. Read the display. Note:•“-”(minus sign) is displayed when the polarity of the test leads is reserved.•Use the test leads with the normal polarity when measuring a voltage that includes spike pulses (such as horizontal output signal of a TV set).

仪器

直流

二极管

极性

水平的home

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||. Measuring AC voltages1. Set the function switch to ACV.2. Connect the test leads to the circuit to be measured.3. Read the display.Note: It is not necessary to consider the polarity of the test leads.|||. Measuring resistance 1. Set the function switch toΩ.2. Connect the test leads to the circuit to be measured.3. Read the display.Note: Be sure to turn off the power of the circuit to be measured before connecting the leads.

试表笔

交流电压

开关

显示值

电阻

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该仪表是用于测量直流电压、交流电压和电阻，并进行（线路的）通断和二极管测试的。该仪表也被称作数字多用表。该仪表的使用方法如下。 |. 直流电压的测量： 1. 功能开关置于 DCV 。 2. 测试表笔接在被测电路上。 3. 读取显示值。注：•表笔极性反接时，会出现“ -” （负号）。•在测量包含有尖脉冲的电压时（如电视中的水平 输出信号）使用带有正常极性的测试表笔。

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||. 交流电压的测量： 1. 功能开关置于 ACV 。 2. 测试表笔接在被测电路上。 3. 读取显示值。注：不用考虑试表笔的极性。|||. 电阻测量1. 功能开关置于 Ω 档。2. 测试表笔接在被测电路上。3. 读显示值。注：接表比之前要确认已断开被测电路的电源

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1. This instrument is designed to use for measuring AC voltages, measuring AC voltages, measuring resistance, conductivity test and diode test.

该仪表是用于测量直流电压、交流电压和电阻，并进行（线路的）通断和二极管测试的。

Notes

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2. The following is illustrating the

operation. 该仪表的使用方法如下。

Notes

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3. 1). Set the function switch to DCV.2). Connect the test leads to the circuit to be measured.3). Read the display. • 1. 功能开关置于 DCV 。• 2. 测试表笔接在被测电路上。• 3. 读取显示值。

Exercises

1.Translate the following English abbreviation on computer keyboard:

(1)operation 操作；用法 (2) buzzer 蜂鸣器 (3) function 功能 (4) range 范围 (5) Test lead 测试笔 (6) measure 测量(7) circuit 电路 (8) display 显示(9) polarity 极性 (10) conductivity 导通性能

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2. Read and translate the following sentences into chinese.

Exercises

(1) Check the position of the function switch by referencing the display before making a measurement. Be sure to keep the tester lead off the object being measured before changing the switch.

在测量之前，需通过参照显示值来检查功能开关的位置。在转换开关之前需确认物体已连接测试仪。

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Exercises

(2) Avoid storing the instrument in locations where temperature or humidity is excessively high and dew is formed.

避免把仪器放置于潮湿或者是温度过高的地方。

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Oral practice

Dialogue A

A: How to write a program?

B: It’s too difficult for me, you need a professional.

A: Thank you all the same.

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Translation of Oral Practice

Dialogue A

A: 怎么编程呀？B: 这对我来说太难了，你需要向专家请教。A: 还是谢谢你。

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Oral practice

Dialogue BDialogue BA: Can you say something about programming?B: Programming is at its simplest the way

people tell computer what to do, when to do it and how to do it.

A: OK, I know, thank you.B: It’s my pleasure.

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Translation of Oral Practice

Dialogue BA: 你能讲讲编程吗？B: 变成是让人们告诉电脑做什么，什么时候

做和怎么去做的最便利的方法。A: 好吧，我知道了，谢谢你。B: 不客气！

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