Whether through tests to eliminate early failure LED TUBE LIGHTS?
25/09/2013 10:38
Whether through tests to eliminate early failure LED TUBE LIGHTS?
Like other semiconductor devices , LED TUBE LIGHTS can learn from semiconductor diodes, transistors and integrated circuits screening methods
Early failure of the product is easy to remove the device , thereby reducing the area of the client application into the failure rate .
Failure model has been worked out for a variety of screening tests approach , following are some of the commonly used methods :
( 1 ) Electric accelerated fatigue tests
In each production batch of LED TUBE LIGHTS products in accordance with the provisions of the sampling rate of a certain number of random samples of defects
The larger the strength of the product is exposed electric stress , so as to achieve the purpose of removing . Example of conventional low-power LED TUBE LIGHTS,
The IF = 30mA, temperature 85 ℃ aging for more than 240 hours and then tested statistical failure rate exceeds a predetermined ratio to see if
Rate , such as more than , this batch screening , excluding early failures products.
( 2 ) Environmental Testing
LED test is to simulate the environment encountered in the application of various natural phenomena of the invasion, the test LED can afford. If the LED applications such as rocket apparatus, when the rocket during launch , LED will be the acceleration of gravity ,
Shock and vibration, temperature changes and other attacks constitute LED TUBE LIGHTS material impact various stresses occur . If the process does not
Adequate prevention, it is likely to lead LED failure .
In general , environmental testing on the production of LED TUBE LIGHT is not all tests , because some of the tests are destructive tests ,
Test samples will produce changes in appearance and performance . Can no longer be manufactured products . Therefore, environmental testing using periodic sampling method . This
Class testing in general are:
(A) high and low temperature impact test - from high to low mutation of several attacks .
(B) Temperature cycle test - High Low High Low cycle.
(C) the moist test - at a specified temperature and humidity requirements for storage under the LED time .
(D) salt spray test - stored under an atmosphere at a predetermined specified time salinity .
(E) dust test - stored under simulated in a desert environment or working .
(F) irradiation test - various irradiation observe the LED optoelectronic properties.
(G) vibration, shock test - the required amplitude and frequency of the LED during transportation simulation test .
(H) Drop test - the fall in the number of times a certain height .
(I) leads tensile and bending tests - the LED TUBE LIGHTS pinout tested for tensile strength and bending tests.
(J) centrifugal acceleration test - Analog LED rotating state affordability.
So some simulated LED may encounter a variety of natural phenomena and the use of the environment, and test its ability to withstand a variety of configurations
The stress state matching pieces .
( 3 ) Life Test
In order to observe the LED in the case of long-term continuous use , the variation of the optical properties , LED system
Manufacturers must be sampled for each category of species for long-term aging powered to examine this particular type of product "lifetime " Time .
Through the different processes , materials, each type of product thousands , or even tens of hours of follow-up observations . Accumulation of data, thus making it
Our work as expected "average life" of statistics.
Life test specified in general environmental conditions , the LED TUBE LIGHTS plus the nominal power is set , the long-term aging is energized , and
Periodic testing of optical parameters of its records relating to draw relevant comparison value .
Early failure of the product is easy to remove the device , thereby reducing the area of the client application into the failure rate .
Failure model has been worked out for a variety of screening tests approach , following are some of the commonly used methods :
( 1 ) Electric accelerated fatigue tests
In each production batch of LED TUBE LIGHTS products in accordance with the provisions of the sampling rate of a certain number of random samples of defects
The larger the strength of the product is exposed electric stress , so as to achieve the purpose of removing . Example of conventional low-power LED TUBE LIGHTS,
The IF = 30mA, temperature 85 ℃ aging for more than 240 hours and then tested statistical failure rate exceeds a predetermined ratio to see if
Rate , such as more than , this batch screening , excluding early failures products.
( 2 ) Environmental Testing
LED test is to simulate the environment encountered in the application of various natural phenomena of the invasion, the test LED can afford. If the LED applications such as rocket apparatus, when the rocket during launch , LED will be the acceleration of gravity ,
Shock and vibration, temperature changes and other attacks constitute LED TUBE LIGHTS material impact various stresses occur . If the process does not
Adequate prevention, it is likely to lead LED failure .
In general , environmental testing on the production of LED TUBE LIGHT is not all tests , because some of the tests are destructive tests ,
Test samples will produce changes in appearance and performance . Can no longer be manufactured products . Therefore, environmental testing using periodic sampling method . This
Class testing in general are:
(A) high and low temperature impact test - from high to low mutation of several attacks .
(B) Temperature cycle test - High Low High Low cycle.
(C) the moist test - at a specified temperature and humidity requirements for storage under the LED time .
(D) salt spray test - stored under an atmosphere at a predetermined specified time salinity .
(E) dust test - stored under simulated in a desert environment or working .
(F) irradiation test - various irradiation observe the LED optoelectronic properties.
(G) vibration, shock test - the required amplitude and frequency of the LED during transportation simulation test .
(H) Drop test - the fall in the number of times a certain height .
(I) leads tensile and bending tests - the LED TUBE LIGHTS pinout tested for tensile strength and bending tests.
(J) centrifugal acceleration test - Analog LED rotating state affordability.
So some simulated LED may encounter a variety of natural phenomena and the use of the environment, and test its ability to withstand a variety of configurations
The stress state matching pieces .
( 3 ) Life Test
In order to observe the LED in the case of long-term continuous use , the variation of the optical properties , LED system
Manufacturers must be sampled for each category of species for long-term aging powered to examine this particular type of product "lifetime " Time .
Through the different processes , materials, each type of product thousands , or even tens of hours of follow-up observations . Accumulation of data, thus making it
Our work as expected "average life" of statistics.
Life test specified in general environmental conditions , the LED TUBE LIGHTS plus the nominal power is set , the long-term aging is energized , and
Periodic testing of optical parameters of its records relating to draw relevant comparison value .