تدريب Shadowing: What is SMT (Surface Mount Technology)? PCB Assembly (Part 3) - تعلم التحدث بالإنجليزية عبر الفيديو
جارٍ إنشاء الدرس...
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
📺 نفس القناة
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
✨ فيديو موصى به
C13
47 جمل
Seven Testing Principles: Software Testing
Business EnglishUniversity StudentsWorking Adults
C11
19 جمل
Types of Proximity Sensors! #automation #engineering #science #robotics #electronics
Business EnglishUniversity StudentsWorking Adults
C14
28 جمل
Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites
Business EnglishUniversity StudentsWorking Adults
C11
181 جمل
Aircraft General Knowledge | PPL Expert Online Ground School FREE Sample
Business EnglishUniversity StudentsWorking Adults
C11
50 جمل
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 جمل
EDFR GWO BTT Training Center - Nicolas Riou Wind
Business EnglishUniversity StudentsWorking Adults
C12
153 جمل
S3 Speech1 short
Business EnglishUniversity StudentsWorking Adults
C14
32 جمل
UltraSnap® Surface ATP Test
Business EnglishUniversity StudentsWorking Adults
C11
282 جمل
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 جمل
Types Of Manufacturing Processes (Job Shop, Batch, Mass, Flow, Process Type Manufacturing Processes)
Business EnglishUniversity StudentsWorking Adults
المفردات وملاحظات التحدث لهذا الدرس
هذا الدرس في المحادثة بمستوى C1 مبني على الفيديو “What is SMT (Surface Mount Technology)? PCB Assembly”. أكثر الكلمات تكرارًا في الفيديو: failure, board, circuit, testing, inspection. يحتوي هذا الفيديو على 56 جملة و769 كلمة للتدرب على الترديد. مدة الكلام 5:51. يتكلم المتحدث بسرعة ثابتة، نحو 131 كلمة في الدقيقة، وهي سرعة مريحة للترديد. 77% فقط من الكلمات ضمن أكثر 3,000 كلمة شيوعًا في الإنجليزية، فالمفردات صعبة نسبيًا.
أهم المفردات في هذا الفيديو
أصعب 15 كلمة في الفيديو، مع النطق والمعنى:
| الكلمة | النطق | المعنى |
|---|---|---|
| probe اسم | /pɹoʊb/ | مِسْبَار |
| automate فعل | /ˈɔ.təˌmeɪt/ | أَتْمَتَ |
| defect اسم | /ˈdiːfɛkt/ | خَلَل, عَيْب |
| infant اسم | /ˈɪn.fənt/ | رَضِيع |
| graph اسم | /ɡɹæf/ | مُخَطَّط بَيَانِيّ |
| bathtub اسم | /ˈbæθtʌb/ | بَانْيُو, مَغْسَل |
| latent صفة | /ˈleɪ.tənt/ | كَامِن, دَفِين |
| oscillation اسم | /ˌɒ.sɪˈleɪ.ʃən/ | تَذَبْذُب |
| microscope اسم | /ˈmaɪ.kɹəˌskoʊp/ | مِجْهَر |
| accelerate فعل | /ɪkˈsɛl.əˌɹeɪt/ | سَرَّعَ |
| offline صفة | /ɔfˈlaɪn/ | غَيْر مُتَّصِل, غَيْر مُتَوَاجِد |
| imply فعل | /ɪmˈplaɪ/ | اِنْطَوَى |
| notification اسم | /ˌnoʊtɪfɪˈkeɪʃn̩/ | إِشْعَار, إِخْطَار |
| dense صفة | /ˈdɛns/ | كَثِيف, غَلِيظ |
| upload فعل | /ˈʌpˌloʊd/ | حَمّل |
الأفعال المركبة التي ستسمعها
| الكلمة | النطق | المعنى |
|---|---|---|
| carry out فعل | /ˈkæ.ɹi aʊt/ | شَغَّلَ, نَفَّذَ |
نطق يحتاج إلى انتباه
يستخدم المتحدث 3 من الصيغ المختصرة، مثل don't, you'll. انطقها بصيغتها القصيرة كما تسمعها.
- أصوات “th”: bathtub /ˈbæθtʌb/, threshold /ˈθɹɛʃ(h)oʊld/
- أصوات “sh” و“zh”: oscillation /ˌɒ.sɪˈleɪ.ʃən/, insulation /ˌɪnsəˈleɪʃən/, shipment /ˈʃɪpmənt/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, threshold /ˈθɹɛʃ(h)oʊld/
- الكلمات الطويلة — انتبه لموضع النبر: mortality /mɔɹˈtælɪti/, oscillation /ˌɒ.sɪˈleɪ.ʃən/, accelerate /ɪkˈsɛl.əˌɹeɪt/, insulation /ˌɪnsəˈleɪʃən/, continuity /ˌkɑn.tɪˈn(j)u.ə.ti/
كيف تتدرب بهذا الفيديو
- استمع إلى الفيديو كاملًا مرة واحدة دون أن تتكلم، ودوّن الكلمات التي لا تعرفها.
- ردّد جملة جملة بالسرعة العادية، وكرّر كل جملة حتى يتطابق إيقاعك مع المتحدث.
- سجّل صوتك وقارنه بالأصل، مع الانتباه إلى كلمات مثل probe, automate, defect.
ما هي تقنية التظليل الصوتي؟
التظليل الصوتي (Shadowing) تقنية تعلم لغة مدعومة علمياً، طُورت أصلاً لتدريب المترجمين الفوريين المحترفين. الطريقة بسيطة لكنها قوية: تستمع لصوت إنجليزي أصلي وتكرره فوراً بصوت عالٍ — كظل يتبع المتحدث بتأخير 1-2 ثانية. تُظهر الأبحاث تحسناً كبيراً في دقة النطق والتنغيم والإيقاع وربط الأصوات والاستماع والطلاقة.