Shadowing Practice: What is SMT (Surface Mount Technology)? PCB Assembly (Part 3) - Learn English Speaking with Video
Les maken...
1
Welcome to this video.
2
This is part 3 of using surface mount technology to assemble PCBs.
3
Electrical testing process.
4
This is the last section of the process as you can see here.
5
So So physical testing of printed circuit boards can also be carried out within the SMT production line.
6
This is known as inline testing.
7
However, it is more common for physical testing to be carried out offline in a separate area or test station.
8
This is known as in-circuit testing.
9
Although the generic term in-circuit testing or ICT is widely used within the electronics manufacturing industry,
10
there are actually several different types of tester that are available.
11
The type of tester required is dependent upon the manufacturing test process used, the volume and the boards that are used.
12
Let's have a look at the different types of in-circuit tester.
13
Let's start with the flying probe tester.
14
In view of the issues of developing and manufacturing complete bed of nail access fixtures,
15
they are costly and difficult to change if any component positions or tracks are moved.
16
Another approach is to use a roving or flying probe.
17
This has a simple fixture to hold the board
18
and contact is made via a few probes that can move around the board and make contact as required.
19
These are moved under software control so any board updates can be accommodated with changes to the software program.
20
Another reason to use flying probes is the shrinking component size and denser chip scale packaging technologies.
21
Manufacturing Defect Analyzer or MDA.
22
The tester makes contact to the board under test using a bed of nails fixture
23
and this means that a different fixture is generally required for each board.
24
It needs to make contact with specific points on the board where often there may be test point
25
or a land area for the probe.
26
This form of tester offers a basic in circuit test of resistance, continuity and insulation.
27
As the name implies it is just used for detecting the manufacturing defects like short circuits across tracks and open circuit connections.
28
Automated X-ray inspection.
29
AXI as is known is a technology based on the same principles as automated optical inspection or AOI.
30
It uses x-rays as its source instead of visible light to automatically inspect features which are typically hidden from view.
31
Automated x-ray inspection equipment can not only check the solder joints under components,
32
but also reveal any defects in solder joints that may not be visible with ordinary optical inspection equipment.
33
First off, sample inspection.
34
The inspection microscope is generally used in FAI or first article inspection,
35
which is required to ensure that the first product produced is 100% correct.
36
In the SME industry, there is a need to ensure
37
that the first off from any SMT assembly line is perfect before running the rest of the batch.
38
Functional testing.
39
At the end of the line, there needs to be a functional test to establish if the PCB actually functions and conforms to specification.
40
The key features of the functional test are Identify errors in all functional aspects of the PCB
41
Identify failure thresholds in the PCB when both upper and lower voltages are applied Simulate the operating environment for the PCB
42
Verify speed, frequency, oscillations and other onboard timing elements Verify all input and output features conform to specification
43
and establish all communication features are operational.
44
Burn-in testing.
45
Burn-in is a technique used as part of the quality insurance
46
procedures where assembled printed circuit boards are operated under both normal and accelerated environmental conditions prior to shipment.
47
Theoretically, any weak components would fail during the burn-in time allowing those parts to be replaced.
48
Replacing the weak components would prevent premature failure, infant mortality failure, or other latent defects.
49
On the right-hand side here, we can see a typical burn-in bathtub graph.
50
We can see that the decreasing failure rate shows the early infant mortality failures.
51
The constant failure rate covers the constant or random failures, whereas the increasing failure rate shows the wearout failures.
52
This graph is failure rate over time
53
Don't forget to check out our other videos in this PCB series
54
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
55
And you see this little bell symbol If you hit that you'll get a notification each time we upload new content
56
So thanks for listening, my name is Paul Adams from SofEast and I shall see you in the next video
📺 Zelfde Kanaal
C17
What is SMT (Surface Mount Technology)? PCB Assembly (Part 2)
Business EnglishUniversity StudentsWorking Adults
C1Sofeast PCB Video Series Introduction
Business EnglishUniversity StudentsWorking Adults
B22
DFM And DFA Explained
Business EnglishUniversity StudentsWorking Adults
C14
PCB Inspection Methods & Common PCB Defects
Business EnglishUniversity StudentsWorking Adults
C13
NPI Process 1: Why A Pilot Run Before Mass Production Is Very Useful
Business EnglishUniversity StudentsWorking Adults
C15
What is SMT (Surface Mount Technology)? PCB Assembly (Part 1)
Business EnglishUniversity StudentsWorking Adults
B2BONUS: Should we do PCB or enclosure design first? (Feat Andrew Amirnovin)
Business EnglishUniversity StudentsWorking Adults
B2What are PCBs and PCBAs? The 'PCB basics'
University StudentsWorking Adults
B1Don’t Approve a Product Until You’ve Lived With It
Business EnglishWorking Adults
B1The Product Passed the Safety Test, But Was Still Too Hot to Hold
Business EnglishWorking Adults
B2The Product Worked, But the Packaging Made It Look Dead
Business EnglishWorking Adults
B2Why User Experience Is Harder Than Engineering
Business EnglishUniversity StudentsWorking Adults
C14 NPI Tips Before You Move Into Mass Production
Business EnglishWorking Adults
C1The Production Validation Test (PVT) Phase of the NPI Process
Business EnglishWorking Adults
C1The Three NPI Phases Explained
Business EnglishUniversity StudentsWorking Adults
C1When Can The NPI Process Begin?
Business EnglishUniversity StudentsWorking Adults
C1NPI Process #3: Why A Feasibility Study With Suppliers Saves Time & Prevents Issues
Business EnglishWorking Adults
C1NPI Process 2: New Product Development Process (Why Planning Before Prototyping Saves Time)
Business EnglishUniversity StudentsWorking Adults
C1PCBs | Electronic Goods Reliability Testing
Business EnglishUniversity StudentsWorking Adults
✨ Aanbevolen Video
C13
47 zinnen
Seven Testing Principles: Software Testing
Business EnglishUniversity StudentsWorking Adults
C11
19 zinnen
Types of Proximity Sensors! #automation #engineering #science #robotics #electronics
Business EnglishUniversity StudentsWorking Adults
C14
28 zinnen
Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites
Business EnglishUniversity StudentsWorking Adults
C11
181 zinnen
Aircraft General Knowledge | PPL Expert Online Ground School FREE Sample
Business EnglishUniversity StudentsWorking Adults
C11
50 zinnen
0.0.1 How to become a CAE Engineer CAE | What are the ways to become a CAE Engineer as a fresher
Business EnglishUniversity StudentsWorking Adults
C11
106 zinnen
EDFR GWO BTT Training Center - Nicolas Riou Wind
Business EnglishUniversity StudentsWorking Adults
C12
153 zinnen
S3 Speech1 short
Business EnglishUniversity StudentsWorking Adults
C14
32 zinnen
UltraSnap® Surface ATP Test
Business EnglishUniversity StudentsWorking Adults
C11
282 zinnen
什麼是屏蔽罩(shielding can)？工程師對屏蔽罩的愛恨情仇
Business EnglishUniversity StudentsWorking Adults
C15
50 zinnen
Types Of Manufacturing Processes (Job Shop, Batch, Mass, Flow, Process Type Manufacturing Processes)
Business EnglishUniversity StudentsWorking Adults
Woordenschat en spreektips bij deze les
Deze spreekles op niveau C1 is gebaseerd op de video “What is SMT (Surface Mount Technology)? PCB Assembly”. Deze woorden komen het vaakst terug: failure, board, circuit, testing, inspection. Deze video bevat 56 zinnen en 769 woorden om na te spreken. Het gesproken deel duurt 5:51. De spreker praat in een gelijkmatig tempo van ongeveer 131 woorden per minuut, prettig om te shadowen. Slechts 77% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
De 15 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| automate werkwoord | /ˈɔ.təˌmeɪt/ | automatiseren |
| defect zelfstandig naamwoord | /ˈdiːfɛkt/ | gebrek, mankement |
| solder zelfstandig naamwoord | /ˈsɒl.də(ɹ)/ | soldeersel |
| conform werkwoord | /kənˈfɔɹm/ | conformeren |
| assemble werkwoord | /əˈsɛm.bəl/ | in elkaar zetten |
| specification zelfstandig naamwoord | specificatie | |
| mortality zelfstandig naamwoord | /mɔɹˈtælɪti/ | sterfelijkheid, mortaliteit |
| infant zelfstandig naamwoord | /ˈɪn.fənt/ | zuigeling |
| graph zelfstandig naamwoord | /ɡɹæf/ | grafiek |
| bathtub zelfstandig naamwoord | /ˈbæθtʌb/ | badkuip, ligbad |
| latent bijvoeglijk naamwoord | /ˈleɪ.tənt/ | latent |
| oscillation zelfstandig naamwoord | /ˌɒ.sɪˈleɪ.ʃən/ | trilling |
| microscope zelfstandig naamwoord | /ˈmaɪ.kɹəˌskoʊp/ | microscoop |
| inspect werkwoord | /ɪnˈspɛkt/ | inspecteren, onderzoeken |
| theoretically bijwoord | theoretisch |
Phrasal verbs die je zult horen
| Woord | Uitspraak | Betekenis |
|---|---|---|
| carry out werkwoord | /ˈkæ.ɹi aʊt/ | uitvoeren |
| check out werkwoord | onderzoeken |
Uitspraak om op te letten
De spreker gebruikt 3 samentrekkingen en verkorte vormen, zoals don't, you'll. Spreek ze kort uit, zoals je ze hoort.
- De “th”-klanken: bathtub /ˈbæθtʌb/, threshold /ˈθɹɛʃ(h)oʊld/
- De klanken “sh” en “zh”: oscillation /ˌɒ.sɪˈleɪ.ʃən/, insulation /ˌɪnsəˈleɪʃən/, shipment /ˈʃɪpmənt/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, threshold /ˈθɹɛʃ(h)oʊld/
- Lange woorden — let op de klemtoon: mortality /mɔɹˈtælɪti/, oscillation /ˌɒ.sɪˈleɪ.ʃən/, accelerate /ɪkˈsɛl.əˌɹeɪt/, insulation /ˌɪnsəˈleɪʃən/, continuity /ˌkɑn.tɪˈn(j)u.ə.ti/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Spreek zin voor zin na op normale snelheid en herhaal elke zin tot je ritme gelijk is aan dat van de spreker.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als automate, defect, solder.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.