Shadowing Practice: What is SMT (Surface Mount Technology)? PCB Assembly (Part 3) - Learn English Speaking with Video
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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
📺 Mismo canal
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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “What is SMT (Surface Mount Technology)? PCB Assembly”. Las palabras que más se repiten: failure, board, circuit, testing, inspection. Este vídeo tiene 56 frases y 769 palabras para practicar shadowing. La parte hablada dura 5:51. El hablante mantiene un ritmo constante de unas 131 palabras por minuto, cómodo para el shadowing. Solo el 77 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| tester sustantivo | /ˈtɛstəɹ/ | téster, tester |
| probe sustantivo | /pɹoʊb/ | tienta, sonda |
| fixture sustantivo | /ˈfɪks.t͡ʃə/ | fixtura |
| automate verbo | /ˈɔ.təˌmeɪt/ | automatizar |
| defect sustantivo | /ˈdiːfɛkt/ | falla, tacha |
| solder sustantivo | /ˈsɒl.də(ɹ)/ | estaño para soldar, estaño |
| conform verbo | /kənˈfɔɹm/ | conformarse con, conformar |
| assemble verbo | /əˈsɛm.bəl/ | ensamblar, montar |
| specification sustantivo | especificación | |
| mortality sustantivo | /mɔɹˈtælɪti/ | mortalidad |
| infant sustantivo | /ˈɪn.fənt/ | nene, infante |
| graph sustantivo | /ɡɹæf/ | gráfico, gráfica |
| bathtub sustantivo | /ˈbæθtʌb/ | bañera, bañadera |
| latent adjetivo | /ˈleɪ.tənt/ | latente |
| oscillation sustantivo | /ˌɒ.sɪˈleɪ.ʃən/ | oscilación, libración |
Phrasal verbs que vas a escuchar
| Palabra | Pronunciación | Significado |
|---|---|---|
| carry out verbo | /ˈkæ.ɹi aʊt/ | llevar a cabo, llevar al cabo |
| check out verbo | investigar, chequear | |
| move around verbo | movilizarse |
Pronunciación a tener en cuenta
El hablante usa 3 contracciones y formas reducidas, como don't, you'll. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “th”: bathtub /ˈbæθtʌb/, threshold /ˈθɹɛʃ(h)oʊld/
- Los sonidos de “sh” y “zh”: oscillation /ˌɒ.sɪˈleɪ.ʃən/, insulation /ˌɪnsəˈleɪʃən/, shipment /ˈʃɪpmənt/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, threshold /ˈθɹɛʃ(h)oʊld/
- Palabras largas — cuida el acento: mortality /mɔɹˈtælɪti/, oscillation /ˌɒ.sɪˈleɪ.ʃən/, accelerate /ɪkˈsɛl.əˌɹeɪt/, insulation /ˌɪnsəˈleɪʃən/, continuity /ˌkɑn.tɪˈn(j)u.ə.ti/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Haz shadowing frase por frase a velocidad normal, repitiendo cada una hasta que tu ritmo coincida con el del hablante.
- Grábate y compara con el original, prestando atención a palabras como tester, probe, fixture.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.