Light-emitting Diode, short for LED, has widely uses in modern society, such as lighting, flat panel display and medical devices, it through the combination of electrons and holes to release energy light, can efficiently convert electrical energy into light energy. With the continuous progress of technology, this electronic component from early only emit low-light red light develop to other monochromatic light and other 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 21st century, which with the advantages of traditional light sources can not be comparable as high efficiency, long life, material is not easily affected by the environment and relatively stable.
There is heavy traffic on the zebra crossing every day, as the guide of traffic rules - the traffic light is also working hard every day. Coz it is placed outdoors all year round, it must accept the strict reliability test before it work. 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... and so on.
Note: 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 box 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 storage, transportation and adaptability test with electrical, electronic, instruments and other products, parts and materials under high and low temperature alternating wet and hot environment; It is a reliability test equipment for all kinds of electronic, 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 and moisture resistance cycle test.
Recommended model 2: Salt spray test chamber
The salt water 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). Comply with CNS, ASTM, JIS, ISO and other standards. The salt water spray test is to test the corrosion resistance of product surface materials after anti-corrosion treatment such as coating, electroplating, anodic treatment and anti-rust oil.
Recommended model 3: Waterproof and dustproof test chamber
Waterproof and dust proof test chamber is suitable for outdoor terminals such as metering automation terminals and distribution network automation terminals to carry out rain and dust tests, in order 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.
