Burn-in Oven
Burn-in is an electrical stress test that employs voltage and temperature to accelerate the electrical failure of a device. Burn-in essentially simulates the operating life of the device, since the electrical excitation applied during burn-in may mirror the worst-case bias that the device will be subjected to in the course of its useable life. Depending on the burn-in duration used, the reliability information obtained may pertain to the device's early life or its wear-out. Burn-in may be used as a reliability monitor or as a production screen to weed out potential infant mortalities from the lot.
Burn-in is usually done at 125 deg C, with electrical excitation applied to the samples. The burn-in process is facilitated by using burn-in boards (see Fig. 1) where the samples are loaded. These burn-in boards are then inserted into the burn-in oven (see Fig. 2), which supplies the necessary voltages to the samples while maintaining the oven temperature at 125 deg C. The electrical bias applied may either be static or dynamic, depending on the failure mechanism being accelerated.
Figure 1. Photo of Bare and Socket-populated Burn-in Boards
The operating life cycle distribution of a population of devices may be modeled as a bath tub curve, if the failures are plotted on the y-axis against the operating life in the x-axis. The bath tub curve shows that the highest failure rates experienced by a population of devices occur during the early stage of the life cycle, or early life, and during the wear-out period of the life cycle. Between the early life and wear-out stages is a long period wherein the devices fail very sparingly.
Figure 2. Burn-in ovens
Early life failure (ELF) monitor burn-in, as the name implies, is performed to screen out potential early life failures. It is conducted for a duration of 168 hours or less, and normally for only 48 hours. Electrical failures after ELF monitor burn-in are known as early life failures or infant mortality, which means that these units will fail prematurely if they were used in their normal operation.
High Temperature Operating Life (HTOL) Test is the opposite of ELF monitor burn-in, testing the reliability of the samples in their wear-out phase. HTOL is conducted for a duration of 1000 hours, with intermediate read points at 168 H and 500 H.
Although the electrical excitation applied to the samples are often defined in terms of voltages, failure mechanisms accelerated by current (such as electromigration) and electric fields (such as dielectric rupture) are understandably accelerated by burn-in as well.
High Temperature Furnace Inspection Index
What is the high temperature furnace test standard? What metrics are tested? How long is the detection cycle? Which items are tested?
Test items (reference) :
Temperature uniformity test, system accuracy test, temperature, system accuracy, temperature uniformity, high temperature furnace verification and calibration, high temperature furnace (tube furnace) verification and calibration, box resistance furnace (high temperature furnace, heat treatment furnace) verification and calibration, high temperature furnace (box resistance furnace, dry furnace, heat treatment furnace) verification and calibration, silica
List of testing standards:
1, NCS/ CJ M61; SAE AMS 2750; JJF1376 High temperature furnace calibration specification NCS/ CJ M61, high temperature furnace calibration method SAE AMS 2750E, box type resistance furnace calibration specification JJF1376
2, AMS 2750F High temperature measurement AMS 2750F
3, GB 25576-2010 Food safety national standard Food additive silica (high temperature furnace method)
4, JJF 1184 thermocouple verification furnace temperature field test technical specification
5, AMS 2750E high temperature measurement AMS 2750E
6, AMS 2750F high temperature determination method 3.5
7, AMS 2750G high temperature measurement AMS 2750G
8, AMS 2750E high temperature determination method 1
9. JJF 1376; AMS 2750; JJG 276 Calibration specification for box type resistance furnace JJF 1376, high temperature measurement method AMS 2750E, high temperature creep, durable strength testing machine verification regulation JJG 276
10, JJF 1376 box type resistance furnace calibration specification
11, GB/T 9452-2012 heat treatment furnace effective heating zone determination method 1
12. SAE AMS 2750 high-temperature calibration method F
Lab Companion-Rapid Temperature Cycling Test Chamber
Introduction of Lab Companion
With over 20 years of experience, Lab Companion is a world class manufacturer of environmental chambers and an accomplished supplier of turn-key test systems and equipment. All our chambers build on Lab Companion’s reputation for long life and exceptional reliability.
With a scope of design, manufacture and service, Lab Companion has established a quality management system that complies with the International Quality System Standard ISO 9001:2008. Lab Companion’s equipment calibration program is accredited to the International Standard ISO 17025 and the American National Standard ANSI/NCSL-Z-540-1 by A2LA. A2LA is a full member and signatory of the International Laboratory Accreditation Cooperation (ILAC), the Asia Pacific Laboratory Accreditation (APLAC) and the European Cooperation for Accreditation (EA).
Lab Companion’s SE-Series Environmental Test Chambers offer a significantly enhanced airflow system, which provides better gradients and improved product temperature change rates. These chambers utilize Thermotron’s flagship 8800 Programmer/Controller featuring a high resolution 12.1” flat panel display with touch screen user interface, expanded capabilities to graph, data log, edit, access on-screen help, and long term hard drive data storage.
Not only do we offer the highest quality products, we also provide ongoing support designed to keep you up and running long after the initial sale. We provide factory direct local service with an extensive inventory of the parts you might need.
Performance
Temperature range: -70°C to +180°C
Performance: With 23 Kg aluminum load (IEC60068-3-5), the rising rate from +85°C to -40°C is 15℃/min; the cooling rate from -40°C to +85°C is15℃/min too.
Temperature control：± 1°C Dry bulb temperatures from control point after stabilization at the control sensor
Performance is based on an ambient condition of 75°F (23.9°C) and 50% RH
Cooling/Heating Performance based on measurement at the control sensor in the supply air stream
Constructure
Interior
Nonmagnetic Series 300 stainless steel with a high nickel content
Internal seams heliarc welded for hermetic sealing of the liner
Corners and seams designed to allow for expansion and contraction under the temperature extremes encountered
Condensate drain located in the liner floor and under the conditioning plenum
Chamber base is fully welded
“Ultra-Lite” non-settling fiberglass insulation
One adjustable interior stainless steel shelf is standard
Exterior
Die-formed treated sheet steel
Metal access covers provided for easy opening doors to electrical components
Finish water-based, air dry lacquer, sprayed over a cleaned and primed surface
Easy lift-off hinged access doors for servicing the refrigeration system
One 12.5 cm diameter access port with interior weld and removable insulating plug mounted in right hand side wall accessories on hinged door for easy access
Features
Chamber Operation clearly displays helpful run-time information
Graphing Screen offers expanded capabilities, enhanced programming and reporting
System Status displays crucial refrigeration system parameters
Program Entry makes it easy to load, view and edit profiles
Set Up quick-step wizards make profile entry easy
Pop-up Refrigeration Charts for handy reference
Therm-Alarm® provides over & under temperature alarm protection
Activity Log Screen provides comprehensive equipment history
Web Server allows internet access to equipment via Ethernet
User-Friendly Pop-up Key Pad makes data entry quick and easy
Includes:
- Four USB Ports-two External & two Internal
- Ethernet
- RS-232
Technical specifications
1-4 independently programmable channels
Measuring Accuracy: 0.25% of span typical
Selectable °C or °F temperature scale
12.1” (30 cm) color flat panel touch screen display
Resolution: 0.1°C, 0.1%RH, 0.01 for other linear applications
Real time clock included
Sample Rate: Process variable sampled every 0.1 seconds
Proportional Band: Programmable 1.0° to 300°
Control Method: Digital
Intervals: Unlimited
Interval Resolution: 1 sec to 99 hrs,59 min with 1 second resolution
- RS-232
- 10+ Years Data Storage
- Product Temperature Control
- Event Relay Board
Operating Modes: Automatic or Manual
Program Storage: Unlimited
Program Loops:
- Up to 64 loops per program
Loops can be repeated up to 9,999 times program
- Up to 64 nested loops are allowed per
The Relationship Between the Altitude of the Standard Atmosphere and Air Temperature and Pressure
The standard atmosphere referred to here refers to the "1964, ICAO Standard atmosphere" adopted by the International Civil Aviation Organization. Below an altitude of 32 km, it is the same as "1976, U.S. standard atmosphere". Changes in air temperature near the surface (below 32 km) are:
Ground: The air temperature is 15.0℃, the air pressure P=1013.25mb= 0.101325MPa
Temperature change rate from ground to elevation 11 km: -6.5 ℃/ km
On the 11km interface:
The air temperature is -56.5 ℃ and the air pressure P=226.32mb
Temperature change rate at elevations of 11-20 km: 0.0℃/ km
Temperature change rate at altitude 20-32 km: +1.0/ km
The following table lists the temperature and pressure values of the standard atmosphere at different altitudes. In the table, "gpm" is the altitude meter, and its negative sign represents the altitude
Gpm
Temperature℃
Atmospheric pressure(mb)
Gpm
Temperature℃
Atmospheric pressure(mb)
Gpm
Temperature℃
Atmospheric pressure(mb)
-400
17.6
1062.2
4800
-16.2
554.8
10000
-50.0
264.4
-200
16.3
1037.5
5000
-17.5
540.2
10200
-51.3
256.4
0
15.0
1013.3
5200
-18.8
525.9
10400
-52.6
248.6
200
13.7
989.5
5400
-20.1
511.9
10600
-53.9
241.0
400
12.4
966.1
5600
-21.4
498.3
10800
-55.2
233.6
600
11.1
943.2
5800
-22.7
484.9
11000
-56.5
226.3
800
9.8
920.8
6000
-24.0
471.8
11500
-56.5
209.2
1000
8.5
898.7
6200
-25.3
459.0
12000
-56.5
193.3
1200
7.2
877.2
6400
-26.6
446.5
12500
-56.5
178.7
1400
5.9
856.0
6600
-27.9
434.3
13000
-56.5
165.1
1600
4.6
835.2
6800
-29.2
422.3
13500
-56.5
152.6
1800
3.3
814.9
7000
-30.5
410.6
14000
-56.5
141.0
2000
2.0
795.0
7200
-31.8
399.2
14500
-56.5
130.3
2200
0.7
775.4
7400
-33.1
388.0
15000
-56.5
120.5
2400
-0.6
756.3
7600
-34.4
377.1
15500
-56.5
111.3
2600
-1.9
737.5
7800
-35.7
366.4
16000
-56.5
102.9
2800
-3.2
719.1
8000
-37.0
356.0
17000
-56.5
87.9
3000
-4.5
701.1
8200
-38.3
345.8
18000
-56.5
75.0
3200
-5.8
683.4
8400
-39.6
335.9
19000
-56.5
64.1
3400
-7.1
666.2
8600
-40.9
326.2
20000
-56.5
54.7
3600
-8.4
649.2
8800
-42.2
316.7
22000
-54.5
40.0
3800
-9.7
632.6
9000
-43.5
307.4
24000
-52.5
29.3
4000
-11.0
616.4
9200
-44.8
298.4
26000
-50.5
21.5
4200
-12.3
600.5
9400
-46.1
289.6
28000
-48.5
15.9
4400
-13.6
584.9
9600
-47.4
281.0
30000
-46.5
11.7
4600
-14.9
569.7
9800
-48.7
272.6
32000
-44.5
8.7
Unit conversion relation
1mbar=100Pa=0.1KPa=0.0001 Mpa
1ft=0.3048m=304.8mm
55000ft*0.3048=16764m
Lab Companion focused on the production of reliability environmental test equipment for 19 years, successfully helped 18,000 enterprises to test the reliability and environmental performance of products and materials.
The main products are: high temperature test chamber, high and low temperature and humidity test chamber, walk-in environmental test chamber, rapid temperature cycling test chamber, thermal shock test chamber, high and low temperature low pressure test chamber, vibration of the comprehensive chamber and other test equipment manufacturing solutions to help enterprises R & D bigger and stronger!
If you need to know more about the products of the environmental test chamber, you can search the official website of "Lab Companion", feel free to contact us for consultation, we can provide you with one-on-one professional technical advice and guidance.
ESS Environmental Stress Screening Test Chamber
The full horizontal air supply system from right to left with large air volume is adopted, so that all specimen cars and specimens on the test are charged and divided, and the heat exchange is completed evenly and quickly.
◆ The utilization rate of test space is as high as 90%
◆ The special design of "uniform horizontal air flow system" of ESS equipment is the patent of Ring measurement.
Patent number: 6272767
◆ Equipped with air volume regulation system
◆ Unique turbine circulator (air volume can reach 3000~ 8000CFM)
◆ Floor type structure, convenient loading and unloading of tested products
◆ According to the special structure of the tested product, the box suitable for installation is used
◆ The control system and refrigeration system can be separated from the box, which is easy to plan or do noise reduction in the laboratory
◆ Adopt cold balance temperature control, more energy saving
◆ Equipment adopts the world's top brand Sporlan refrigeration valve with high reliability and long life
◆ The refrigeration system of the equipment adopts thickened copper pipe
◆ All the strong electric parts are made of high temperature resistant wires, which has higher safety
Reliability Testing Acceleration Testing
Most semiconductor devices have lifetimes that extend over many years at normal use. However, we cannot wait years to study a device; we have to increase the applied stress. Applied stresses enhance or accelerate potential fail mechanisms, help identify the root cause, and help labcompanion take actions to prevent the failure mode.
In semiconductor devices, some common accelerants are temperature, humidity, voltage, and current. In most cases, the accelerated testing does not change the physics of the failure, but it does shift the time for observation. The shift between accelerated and use condition is known as ‘derating.’
Highly accelerated testing is a key part of JEDEC based qualification tests. The tests below reflect highly accelerated conditions based on JEDEC spec JESD47. If the product passes these tests, the devices are acceptable for most use cases.
Temperature Cycle
Per the JESD22-A104 standard, temperature cycling (TC) subjects the units to extreme high and low temperatures transitions between the two. The test is performed by cycling the unit's exposure to these conditions for a predetermined number of cycles.
High Temperature Operating Life (HTOL)
HTOL is used to determine the reliability of a device at high temperature while under operating conditions. The test is usually run over an extended period of time according to the JESD22-A108 standard.
Temperature Humidity Bias/Biased Highly Accelerated Stress Test (BHAST)
According to the JESD22-A110 standard, THB and BHAST subject a device to high temperature and high humidity conditions while under a voltage bias with the goal of accelerating corrosion within the device. THB and BHAST serve the same purpose, but BHAST conditions and testing procedures enable the reliability team to test much faster than THB.
Autoclave/Unbiased HAST
Autoclave and Unbiased HAST determine the reliability of a device under high temperature and high humidity conditions. Like THB and BHAST, it is performed to accelerate corrosion. Unlike those tests, however, the units are not stressed under a bias.
High Temperature Storage
HTS (also called Bake or HTSL) serves to determine long-term reliability of a device under high temperatures. Unlike HTOL, the device is not under operating conditions for the duration of the test.
Electrostatic Discharge (ESD)
Static charge is an unbalanced electrical charge at rest. Typically, it is created by insulator surfaces rubbing together or pulling apart; one surface gains electrons, while the other surface loses electrons. The result is an unbalanced electrical condition known as static charge.
When a static charge moves from one surface to another, it becomes Electrostatic Discharge (ESD) and moves between the two surfaces in a form of a miniature lightning bolt.
When a static charge moves, it becomes a current that can damage or destroy gate oxide, metal layers, and junctions.
JEDEC tests ESD in two different ways:
1. Human Body Mode (HBM)
A component level stress developed to simulate the action of a human body discharging accumulated static charge through a device to ground.
2. Charged Device Model (CDM)
A component level stress that simulates charging and discharging events that occur in production equipment and processes, per the JEDEC JESD22-C101 specification.
Lab Ovens and Lab Furnaces
Design with sample protection as the primary goal
Lab ovens are an indispensable utility for your daily workflow, from simple glassware drying to very complex temperature-controlled heating applications. Our portfolio of heating and drying ovens provides temperature stability and reproducibility for all your application needs. LABCOMPANION heating and drying ovens are designed with sample protection as a primary goal, contributing to superior efficiency, safety and ease of use.
Understand natural and mechanical convection
Principle of natural convection:
In a natural convection oven, hot air flows from bottom to bottom, so that the temperature is evenly distributed (see figure above). No fan actively blows the air inside the box. The advantage of this technology is ultra-low air turbulence, which allows for mild drying and heating.
Principle of mechanical convection:
In a mechanical convection (forced air drive) oven, an integrated fan actively drives the air inside the oven to achieve uniform temperature distribution throughout the chamber (see figure above). A major advantage is excellent temperature uniformity, which enables reproducible results in applications such as material testing, as well as for drying solutions with very demanding temperature requirements. Another advantage is that the drying rate is much faster than natural convection. After opening the door, the temperature in the mechanical convection oven will be restored to the set temperature level more quickly.
Conversion Between Accelerated Aging of Xenon Lamp Aging Test Chamber And Outdoor Aging
Generally speaking, it is difficult to have a detailed positioning and conversion formula for the conversion between accelerated aging of xenon lamp aging test chamber and outdoor aging. The biggest problem is the variability and complexity of the outdoor environment. The variables that determine the relationship between xenon lamp aging test chamber exposure and outdoor exposure include:
1. Geographical latitude of outdoor aging exposure sites (closer to the equator means more UV).
2. Altitude (Higher altitude means more UV).
3. Local geographical characteristics, such as the wind can dry the test sample or close to water will produce condensation.
4. Random changes in climate from year to year can lead to a 2:1 change in aging at the same location.
5. Seasonal changes (e.g., winter exposure may be 1/7 of summer exposure).
6. Direction of the sample (5° south vs. vertical facing north)
7. Sample insulation (outdoor samples with insulated backing age 50% faster than uninsulated samples).
8. Working cycle of xenon lamp aging box (light time and wet time).
9. The working temperature of the test chamber (the higher the temperature, the faster the aging).
10. Test the uniqueness of the sample.
11. Spectral Intensity Distribution (SPD) of laboratory light sources
Objectively speaking, accelerated aging and outdoor aging have no convertibility, one is a variable, one is a fixed value, the only thing to do is to obtain a relative value, rather than an absolute value. Of course, it is not to say that relative values have no effect; on the contrary, relative values can also be very effective. For example, you will find that a slight change in design may double the durability of standard materials. Or you may find the same looking material from multiple suppliers, some of which age quickly, most of which take a moderate amount of time to age, and a smaller amount that ages after longer exposure. Or you may find that less expensive designs have the same durability against standard materials that have satisfactory performance over actual service life, such as 5 years.
How Long Is the Xenon Lamp Weathering Test Chamber Equivalent to a Year of Outdoor Exposure?
How long is the xenon lamp weathering test chamber equivalent to a year of outdoor exposure? How to test out its durability? This is a technical problem, but also a lot of users are concerned about the problem. Today's engineers of Lab Companion are going to explain this problem.
This problem looks very simple, in fact, it is a complex problem.We can not just get a simple number, let this number and the test time of the xenon lamp weathering test chamber to multiply, so as to get the outdoor exposure time, nor is the quality of our xenon lamp weathering test chamber not good enough! No matter how good the quality of the xenon lamp weathering test chamber is, how advanced it is, it is still impossible to find only a number to solve the problem. The most important thing is that the outdoor exposure environment is complex and changeable, affected by many factors, what are the specific?
1. The influence of geographical latitude
2. The influence of altitude
3. The influence of geographical environment when testing, such as wind speed.
4. The impact of the season, winter and summer will be different, summer exposure is 7 times the damage of winter exposure.
5. Direction of the test sample
6. Is the sample insulated or uninsulated? Samples placed on insulators will generally age much faster than those not placed on insulators.
7. Test cycle of xenon lamp weathering test chamber
8. Xenon lamp weathering test chamber operating temperature, the higher the temperature, the faster the aging
9. Testing of special materials
10. Spectrum distribution in the laboratory
Hydrogen Fuel Cell Environmental Simulation Test Scheme
At present, the economic development model based on the consumption of non-renewable energy based on coal, oil and natural gas has led to increasingly prominent environmental pollution and greenhouse effect. In order to achieve sustainable development of human beings, a harmonious relationship between man and nature has been established. The development of sustainable green energy has become a subject of great concern in the world.
As a clean energy that can store waste energy and promote the transformation from traditional fossil energy to green energy, hydrogen energy has an energy density (140MJ/kg) that is 3 times that of oil and 4.5 times that of coal, and is regarded as a subversive technological direction of the future energy revolution. Hydrogen fuel cell is the key carrier to realize the conversion of hydrogen energy into electric energy utilization. After the goal of carbon neutrality and carbon peak "double carbon" was proposed, it has gained new attention in basic research and industrial application.
Hydrogen fuel cell environmental test chamber of Lab Companion meets: fuel cell stack and module: 1W~8KW, fuel cell engine :30KW~150KW Low temperature cold start test: -40~0℃ Low temperature storage test: -40~0℃ High temperature storage test: 0~100℃.
Introduction of hydrogen fuel cell environmental test chamber
The product adopts functional modular design, explosion-proof and anti-static, and meets the relevant test standards. The product has the characteristics of high reliability and comprehensive safety warning, which is suitable for the test of the reactor and fuel cell engine system. Applicable power up to 150KW fuel cell system, low temperature test (storage, starting, performance), high temperature test (storage, starting, performance), wet heat test (high temperature and humidity
Safety parts:
1. Explosion-proof camera: real-time record the complete test situation in the box, easy to optimize or adjust in time.
2. Uv flame detector: high-speed, accurate and intelligent fire detector, accurate identification of flame signals.
3. Emergency air exhaust outlet: exhaust the toxic combustible gas in the box to ensure the safety of the test.
4. Gas detection and alarm system: intelligent and rapid identification of combustible gas, automatically generate alarm signals.
5. Double parallel single-pole screw mechanism cold unit: It has the characteristics of classification function, large power, small footprint and so on.
6. Gas precooling system: quickly control the gas temperature requirements to ensure cold start conditions.
7. Stack test rack: stainless steel stack test rack, equipped with water cooling auxiliary cooling system.
Fuel cell system test project
Fuel cell system test project
Fuel cell engine air tightness test
Power generation system quality
The volume of the battery stack
Insulation resistance detection
Starting characteristic test
Rated power starting test
Steady-state characteristic test
Rated power characteristic test
Peak power characteristic test
Dynamic response characteristic test
High temperature adaptability test
Fuel cell engine system performance test
Vibration resistance test
Low temperature adaptability test
Starting test (low temperature)
Power generation performance test
Shutdown test
Low temperature storage test
Low temperature start-up and operation procedures
/
/
Reactor and module test items
Reactor and module test items
Routine inspection
Gas leakage test
Normal operation test
Allow working pressure test
Pressure test of cooling system
Gas channeling test
Impact and vibration resistance tests
Electrical overload test
Dielectric strength test
Pressure difference test
Flammable gas concentration test
Overpressure test
Hydrogen leakage test
Freezing/thawing cycle test
High temperature storage test
Air tightness test
Fuel starvation test
Oxygen/oxidizer deficiency test
Short-circuit test
Lack of cooling/impaired cooling test
Penetration monitoring system test
Ground test
Starting test
Power generation performance test
Shutdown test
Low temperature storage test
Low temperature starting test
Product applicable standards:
GB/T 10592-2008 High and low temperature test chamber technical conditions
GB/T 10586-2006 Humidity test chamber technical conditions
GB/T31467.3-2015
GB/T31485-2015
GB/T2423.1-2208
GB/T2423.2-2008
GB/T2423.3-2006
GB/T2523.4-2008
Electric Vehicle Component Reliability Test Solution
In the trend of global warming and gradual consumption of resources, automotive gasoline is also sharply reduced, electric vehicles are driven by electric energy, reducing the heat of internal combustion engine, carbon dioxide and exhaust gas emissions, for energy saving and carbon reduction and improve the greenhouse effect plays a huge role, electric vehicles are the future trend of road transportation; In recent years, the world's advanced countries actively develop electric vehicles, for thousands of components composed of complex products, its reliability is particularly important, a variety of harsh environments are testing the electronic system of electric vehicles [battery cell, battery system, battery module, electric vehicle motor, electric vehicle controller, battery module and charger...], Hongzhan Technology for you to sort out electric vehicle related parts reliability test solutions, hope to be able to provide customers with reference.
First, different environmental conditions will have different effects on parts and cause them to fail, so the parts of the car need to be tested according to the relevant specifications to meet international requirements and meet the foreign market, the following is the correlation between different environmental conditions and product failure:
A. High temperature will make the product aging, gasification, cracking, softening, melting, expansion and evaporation, resulting in poor insulation, mechanical failure, mechanical stress increase; Low temperature will make the product embrittlement, icing, shrinkage and solidification, mechanical strength reduction, resulting in poor insulation, cracking mechanical failure, sealing failure;
B. High relative humidity will make the product poor insulation, cracking mechanical failure, sealing failure and resulting in poor insulation; Low relative humidity will dehydrate, embrittlement, reduce mechanical strength and lead to cracking and mechanical failure;
C. Low air pressure will cause product expansion, electrical insulation deterioration of the air to produce corona and ozone, low cooling effect and lead to mechanical failure, sealing failure, overheating;
D. Corrosive air will cause product corrosion, electrolysis, surface degradation, increased conductivity, increased contact resistance, resulting in increased wear electrical failure, mechanical failure;
E. Rapid temperature changes will cause local overheating of the product, resulting in cracking deformation and mechanical failure;
F. Accelerated vibration damage or impact will cause the mechanical stress fatigue resonance of the product and lead to an increase in structural damage.
Therefore, products need to pass the following climatic tests to test the reliability of components: Dust (dust) test, high temperature test, temperature and humidity storage test, salt/dry/warm recovery test, temperature and humidity cycle test, immersion/seepage test, salt spray test, low temperature test, thermal shock test, hot air aging test, weather and light resistance test, gas corrosion test, fire resistance test, mud and water test, dew condensation test, high variable temperature cycle test, Rain (waterproof) test, etc.
The following are the test conditions for automotive electronics:
A. IC and interior lights for locomotives,
Recommended model: vibration of the comprehensive chamber
B. Instrument panel, motor controller, Bluetooth headset, tire pressure sensor, GPS satellite positioning system, instrument backlight, interior light, exterior light, automotive lithium battery, pressure sensor, motor and controller, automotive DVR, cable, synthetic resin
Recommended model: constant temperature and humidity test chamber
C. 8.4 "LCD screen for cars
Recommended model: thermal stress recombination machine
Second, automotive electronic parts are divided into three categories, including IC, discrete semiconductor, passive components three categories, in order to ensure that these automotive electronic components meet the highest standards of automotive safety. The Automotive Electronics Council(AEC) is a set of standards AEC-Q100 designed for active parts (microcontrollers and integrated circuits...)and AEC-Q200 designed for passive components, which specifies the product quality and reliability that must be achieved for passive parts. AEC-Q100 is the vehicle reliability test standard formulated by the AEC organization, which is an important entry for 3C and IC manufacturers into the international auto factory module, and also an important technology to improve the reliability quality of Taiwan IC. In addition, the international auto factory has passed the safety standard (ISO-26262). AEC-Q100 is the basic requirement to pass this standard.
1. List of automotive electronic parts for A.EC-Q100: Automotive disposable memory, Power Supply step-down regulator, Automotive photocoupler, three-axis accelerometer sensor, video jiema device, rectifier, ambient light sensor, non-volatile ferroelectric memory, power management IC, embedded flash memory, DC/DC regulator, Vehicle gauge network communication device, LCD driver IC, Single power Supply differential Amplifier, Capacitive proximity switch Off, high brightness LED driver, Asynchronous switcher, 600V IC, GPS IC, ADAS Driver Assistance System Chip, GNSS Receiver, GNSS front-end amplifier...
B. Temperature and humidity test conditions: temperature cycle, power temperature cycle, high temperature storage life, high temperature working life, early life failure rate;
2. List of automotive electronic parts for A.AC-Q200: automotive grade electronic components (compliant with AEC-Q200), commercial electronic components, power transmission components, control components, comfort components, communication components, audio components.
B. Test conditions: high temperature storage, high temperature working life, temperature cycle, temperature shock, humidity resistance.
LED Traffic Light Test
Light-emitting Diode, referred to as LED, is the abbreviation of the English name Light Emitting Diode, through the combination of electrons and holes to release energy light, can efficiently convert electrical energy into light energy, has a wide range of uses in modern society, such as lighting, flat panel display and medical devices. With the continuous progress of technology, this electronic component from the early can only emit low-light red light to develop other monochromatic light, has been widely used in visible light, infrared and ultraviolet light, is widely used in indicators and display boards, and then extended to traffic lights. It is known as a new light source in the 21st century, with high efficiency, long life, material is not easily affected by the environment and relatively stable, with the advantages of traditional light sources can not be comparable.
The traffic on the zebra crossing is heavy every day, as the guide of the traffic rules - the traffic light is also working hard every day, because it is placed outdoors all year round, so it must accept the strict reliability test before it can work. The test conditions include: Voltage electric, failure protection, electromagnetic noise, dust and waterproof, high temperature test, vibration test, salt spray test, insulation voltage, insulation resistance test...
Note: Before other tests, LED traffic lights need to undergo dry heat tests before other tests can be carried out.
Lamp surface test: dry heat test: 60℃/24 hours/applied voltage
Failure judgment: no deformation, loosening, falling off
Temperature resistance test: 70℃(16 hours)→-15℃(16 hours)→R.T., RAMP:≦1℃/min, 2cycle, power supply
Temperature and humidity test: 40℃→RAMP:≦1℃/min→40℃/95%(24 hours), power on
Continuous switching action: 40℃/60~80%, ON(1sec)←→OFF(1sec), 10000 times
Voltage electric: 80 ~ 135V(AC), 170 ~ 270V(AC)
Failure judgment: Light intensity drift ≦20%(110V, 220V light intensity as the benchmark)
Waterproof and dustproof meet IP54 class requirements
Insulation resistance test:
Insulation resistance: 500V
Failure determination: not less than 2MΩ
Insulation withstand voltage test: 1000V/60Hz/1min(after insulation resistance test)
Light chamber test:
High temperature test: 130℃/1 hour
Failure judgment: no deformation, loosening, falling off, cracking... Etc.
Vibration test: XYZ three-way, each 12min for 36min, 10 ~ 35 ~ 10Hz sine wave, each cycle for 3min, total vibration of 2mm
Failure judgment: no deformation, loosening, falling off, cracking, and the LED light surface can be normally lit and operated
Wind tunnel test: Wind speed 16 (51.5-56.4m /s), forward (0 degrees) and side (45 degrees), each blowing for 2 hours
Failure judgment: no deformation, loosening, falling off, cracking
Salt spray test: 96 hours
Failure determination: less than 8 embroider points on the area of 10,000mm^2, LED signal light surface insulation resistance >2MΩ, voltage 1000V/1min, no abnormality
Recommended model 1: high temperature and high humidity test chamber
High temperature and high humidity test chamber is suitable for electrical, electronic, instruments and other products, parts and materials in high and low temperature alternating wet and hot environment storage, transportation, use adaptability test; It is a reliability test equipment for all kinds of electronic, electrical, electrical, plastic and other raw materials and devices to carry out cold resistance, heat resistance, wet resistance, dry resistance test and quality control engineering; Especially suitable for fiber, LCD, crystal, inductance, PCB, battery, computer, mobile phone and other products of high temperature resistance, low temperature resistance, moisture resistance cycle test.
Recommended model 2: vibration of the comprehensive chamber
Vibration of the comprehensive chamber combined with temperature, humidity, vibration function in one, suitable for aerospace products, information electronic instruments, materials, electrical, electronic products, all kinds of electronic components in a comprehensive harsh environment to test their performance indicators. Vibration of the comprehensive chamber mainly for aerospace, aviation, petroleum, chemical, electronics, communications and other scientific research and production units to provide temperature and humidity change environment, at the same time in the test chamber will be electric vibration stress according to the specified period of the test on the test, for the user of the whole machine (or components), electrical appliances, instruments, materials for temperature and humidity, vibration comprehensive stress screening test. In order to assess the adaptability of the test product or to evaluate the behavior of the test product. Compared with the effect of a single factor, it can more truly reflect the adaptability of electrical and electronic products to temperature, humidity and vibration complex environment changes in transportation and actual use, and expose product defects, which is an essential and important test means for the whole process of new product development, prototype test and product qualification test.
Recommended model 3: salt spray test chamber
The salt spray test chamber is suitable for all kinds of communication electronic products, electronic appliances, hardware parts to do neutral salt spray test (NSS) and corrosion test (AASS, CASS), omplied with CNS, ASTM, JIS, ISO and other standards. The salt spray test is to test the corrosion resistance of the products on the surface of various materials after anti-corrosion treatment such as coating, electroplating, anodic treatment and anti-rust oil.
Recommended model 4: waterproof and dustproof test chamber
Waterproof and dustproof test chamber is suitable for outdoor terminals such as metering automation terminals and distribution network automation terminals to carry out rain and dust tests to ensure that the tested products can withstand the impact of harsh environmental changes, so that the products can operate safely and reliably, and are suitable for external lighting and signal devices and automotive lamp shell protection. It can provide realistic simulation of various environments such as water, spray and dust tests that electronic products and their components may be subjected to during transportation and use. In order to detect the waterproof and dustproof performance of various products.
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