쉐도잉 연습: What is SMT (Surface Mount Technology)? PCB Assembly (Part 3) - 영상으로 영어 말하기 배우기
레슨 만드는 중...
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Welcome to this video.
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This is part 3 of using surface mount technology to assemble PCBs.
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Electrical testing process.
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This is the last section of the process as you can see here.
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So So physical testing of printed circuit boards can also be carried out within the SMT production line.
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This is known as inline testing.
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However, it is more common for physical testing to be carried out offline in a separate area or test station.
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This is known as in-circuit testing.
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Although the generic term in-circuit testing or ICT is widely used within the electronics manufacturing industry,
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there are actually several different types of tester that are available.
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The type of tester required is dependent upon the manufacturing test process used, the volume and the boards that are used.
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Let's have a look at the different types of in-circuit tester.
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Let's start with the flying probe tester.
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In view of the issues of developing and manufacturing complete bed of nail access fixtures,
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they are costly and difficult to change if any component positions or tracks are moved.
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Another approach is to use a roving or flying probe.
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This has a simple fixture to hold the board
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and contact is made via a few probes that can move around the board and make contact as required.
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These are moved under software control so any board updates can be accommodated with changes to the software program.
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Another reason to use flying probes is the shrinking component size and denser chip scale packaging technologies.
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Manufacturing Defect Analyzer or MDA.
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The tester makes contact to the board under test using a bed of nails fixture
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and this means that a different fixture is generally required for each board.
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It needs to make contact with specific points on the board where often there may be test point
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or a land area for the probe.
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This form of tester offers a basic in circuit test of resistance, continuity and insulation.
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As the name implies it is just used for detecting the manufacturing defects like short circuits across tracks and open circuit connections.
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Automated X-ray inspection.
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AXI as is known is a technology based on the same principles as automated optical inspection or AOI.
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It uses x-rays as its source instead of visible light to automatically inspect features which are typically hidden from view.
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Automated x-ray inspection equipment can not only check the solder joints under components,
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but also reveal any defects in solder joints that may not be visible with ordinary optical inspection equipment.
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First off, sample inspection.
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The inspection microscope is generally used in FAI or first article inspection,
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which is required to ensure that the first product produced is 100% correct.
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In the SME industry, there is a need to ensure
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that the first off from any SMT assembly line is perfect before running the rest of the batch.
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Functional testing.
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At the end of the line, there needs to be a functional test to establish if the PCB actually functions and conforms to specification.
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The key features of the functional test are Identify errors in all functional aspects of the PCB
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Identify failure thresholds in the PCB when both upper and lower voltages are applied Simulate the operating environment for the PCB
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Verify speed, frequency, oscillations and other onboard timing elements Verify all input and output features conform to specification
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and establish all communication features are operational.
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Burn-in testing.
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Burn-in is a technique used as part of the quality insurance
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procedures where assembled printed circuit boards are operated under both normal and accelerated environmental conditions prior to shipment.
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Theoretically, any weak components would fail during the burn-in time allowing those parts to be replaced.
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Replacing the weak components would prevent premature failure, infant mortality failure, or other latent defects.
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On the right-hand side here, we can see a typical burn-in bathtub graph.
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We can see that the decreasing failure rate shows the early infant mortality failures.
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The constant failure rate covers the constant or random failures, whereas the increasing failure rate shows the wearout failures.
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This graph is failure rate over time
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Don't forget to check out our other videos in this PCB series
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You can contact us if you need any help with your projects at all in China And don't forget to like, share and subscribe to our channel
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And you see this little bell symbol If you hit that you'll get a notification each time we upload new content
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So thanks for listening, my name is Paul Adams from SofEast and I shall see you in the next video
📺 같은 채널
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이 레슨의 어휘와 말하기 포인트
이 C1 수준 말하기 레슨은 영상 “What is SMT (Surface Mount Technology)? PCB Assembly”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: failure, board, circuit, testing, inspection. 이 영상에는 섀도잉할 문장 56개와 단어 769개가 있습니다. 말하는 구간의 길이는 5:51입니다. 화자는 분당 약 131단어의 일정한 속도로 말해서 섀도잉하기에 편한 속도입니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 77%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에서 가장 어려운 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| automate 동사 | /ˈɔ.təˌmeɪt/ | 자동화하다 |
| defect 명사 | /ˈdiːfɛkt/ | 결함 |
| solder 명사 | /ˈsɒl.də(ɹ)/ | 땜납 |
| assemble 동사 | /əˈsɛm.bəl/ | 모으다 |
| specification 명사 | 사양, 스펙 | |
| mortality 명사 | /mɔɹˈtælɪti/ | 사망 |
| infant 명사 | /ˈɪn.fənt/ | 유아, 젖먹이 |
| graph 명사 | /ɡɹæf/ | 그래프, 도표 |
| bathtub 명사 | /ˈbæθtʌb/ | 목욕통, 욕조 |
| microscope 명사 | /ˈmaɪ.kɹəˌskoʊp/ | 현미경 |
| offline 형용사 | /ɔfˈlaɪn/ | 오프라인 |
| notification 명사 | /ˌnoʊtɪfɪˈkeɪʃn̩/ | 통지 |
| dense 형용사 | /ˈdɛns/ | 짙다 |
| upload 동사 | /ˈʌpˌloʊd/ | 업로드하다, 올리다 |
| voltage 명사 | /ˈvəʊltɪd͡ʒ/ | 전압 |
영상에 나오는 구동사
| 단어 | 발음 | 뜻 |
|---|---|---|
| carry out 동사 | /ˈkæ.ɹi aʊt/ | 실행하다, 행하다 |
주의할 발음
화자는 don't, you'll 같은 축약형과 약화된 형태를 3번 사용합니다. 들리는 대로 짧게 발음하세요.
- “th” 소리: bathtub /ˈbæθtʌb/, threshold /ˈθɹɛʃ(h)oʊld/
- “sh”와 “zh” 소리: oscillation /ˌɒ.sɪˈleɪ.ʃən/, insulation /ˌɪnsəˈleɪʃən/, shipment /ˈʃɪpmənt/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, threshold /ˈθɹɛʃ(h)oʊld/
- 긴 단어 — 강세 위치에 주의: mortality /mɔɹˈtælɪti/, oscillation /ˌɒ.sɪˈleɪ.ʃən/, accelerate /ɪkˈsɛl.əˌɹeɪt/, insulation /ˌɪnsəˈleɪʃən/, continuity /ˌkɑn.tɪˈn(j)u.ə.ti/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
- 자신의 목소리를 녹음해 원본과 비교하고, automate, defect, solder 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.