Many people pass the traffic lights at the zebra crossing every day. Looking at the little green man, they remind us to cross the road in time. The red light little red man is fixed. The green light little green man shows the LED diagram of starting to walk and has a countdown to remind us of the remaining seconds. Because it is placed outside the house in the wind and rain all year round, its rigorous reliability test conditions include: voltage electric, failure protection, electromagnetic noise, waterproof layer High temperature test, vibration test, salt spray test, insulation withstand voltage, insulation resistance test Etc.
Test items: voltage electromotion, failure protection, electromagnetic noise, waterproof layer, high temperature test, vibration test
Note: before other tests, LED traffic lights can only be tested after the dry heat test
Lamp surface test: dry heat test: 60 ℃ / 24 hours / applied voltage
Failure determination: no deformation, loosening or falling off
Temperature resistance test: 70 ℃ (16 hours) → -15 ℃ (16 hours) → R.T., ramp: ≤ 1 ℃ /min, 2cycle, power transmission
Temperature and humidity resistance test: 40 ℃ → ramp: ≤ 1 ℃ /min → 40 ℃ /95% (24 hours), powered on
Continuous switching action: 40 ℃ /60~80%, on (1sec) ←→ off (1sec), 10000 times
Electric voltage: 80 ~ 135v (AC), 170 ~ 270V (AC)
Failure determination: light intensity drift ≤ 20% (based on the light intensity at 110V and 220V)
Waterproof and dustproof meet the requirements of IP54
Insulation resistance test:
Insulation resistance: 500V
Failure determination: not less than 2m Ω
Insulation withstand voltage test: 1000v/60hz/1min (after insulation resistance test)
Lamp box test:
High temperature test: 130 ℃ /1 hour
Failure determination: no deformation, loosening, falling off, cracking etc.
Vibration test: XYZ three-way, 12min each, 36min in total, 10 ~ 35 ~ 10Hz sine wave, 3min per cycle, 2mm full vibration
Failure determination: no deformation, looseness, falling off, cracking, and the LED light surface can operate normally
Wind tunnel test: wind speed of 16 levels (51.5 ~ 56.4m/s), positive (0 degrees) and lateral (45 degrees), blowing for 2 hours each
Failure determination: no deformation, looseness, falling off or cracking
Salt spray test: 96 hours
Failure judgment: there are less than 8 embroidered points on the 10000mm^2 area, the insulation resistance of the LED signal light surface is more than 2m Ω, and the withstand voltage is 1000v/1min, without abnormality
