Tablet Computer is a small, portable personal computer which with touch screen as basic input device. It is an electronic product with strong mobility, and it can be seen everywhere in life (such as waiting stations, trains, high-speed trains, cafes, restaurants, meeting rooms, suburbs, etc.). People carry only simple coat protection or even no, in order to user-friendly, its size became smaller so that it can be directly placed in pocket or handbag, but in the process of moving it will experience many environmental physical changes, such as temperature, humidity, vibration, impact, extrusion, etc. and natural damage such as ultraviolet light, sunlight, dust, salt spray, water droplets... It will also cause artificial unintentional injury or abnormal operation and misoperation, and even cause failure and damage (such as: household chemicals, hand sweating, falling, terminal insertion and removal too much, pocket friction, crystal nails...) These will shorten its lif. In order to ensure the reliability of the product and extend service life, we must carry out a number of environmental reliability test projects on it, the following relevant tests for your reference.
Environmental test project description:
Simulate various harsh environments and reliability assessments used by tablet computers to test whether their performance meets the requirements; It mainly includes high and low temperature operation and storage, temperature and condensation, temperature cycle and shock, damp and heat combination test, ultraviolet, sunlight, drip, dust, salt spray and other tests.
Operating temperature range: 0℃ ~ 35℃/5% ~ 95%RH
Storage temperature range: -10℃ ~ 50℃/10% ~ 90%RH
Operating low temperature test: -10℃/2h/ power operation
Operating high temperature test: 40℃/8h/ all running
Storage low temperature test: -20℃/96h/ shutdown
Storage high temperature test: 60℃/96h/ shutdown
High temperature test of vehicle storage: 85℃/96h/ shutdown
Temperature shock: -40℃(30min)←→80℃(30min)/10
Damp heat test: 40℃/95%R.H./48h/ power standby
Damp heat cycle test: 40℃/95%R.H./1h→ramp:1℃/min→-10℃/1h, 20cycles, power standby
Uv test:
According to ASTM-G-154 condition 50℃/4h←→UVA: 340nm/ Temperature: 60℃/4h, a cycle of 8h, total 96h, check the surface appearance and color after the test.
Weather resistance test:
Simulatie the most severe natural conditions of solar thermal effect test, each cycle of 24 hours, 8 hours of continuous exposure, 16 hours to keep dark, each cycle radiation amount of 8.96 kWh/m2 and total 10cycles.
Salt spray test:
5% sodium chloride solution/water temperature 35°C/PH 6.5~7.2/24h/ Shutdown → Pure water wipe shell →55°C/0.5h→ Function test: 2 hours, 40/80%R.H./168h later.
Dripping test: According to IEC60529, in line with IPX2 waterproof rating, can prevent water droplets falling at an Angle of less than 15 degrees from entering the PC and causing damage. Test conditions: water flow rate 3mm/min, 2.5min at each position, checkpoint: after test, 24 hours later, standby for 1 week.
Dust Test:
According to IEC60529, in line with the IP5X dust class, can not completely prevent the entry of dust but does not affect the operation and safety of the appliance, in addition to tablet computers, but also many personal mobile portable 3C products commonly used dust standards, such as: mobile phones, digital cameras, MP3, MP4...
Conditions:
Dust sample 110mm/3 ~ 8h/ test for dynamic operation
After the test, a microscope is used to detect whether dust particles will enter the interior space of the PC.
Chemical staining test:
Confirm the chemical resistance of household chemicals of external components related to the tablet, chemicals: sunscreen, lipstick, hand cream, mosquito repellent, cooking oil (salad oil, sunflower oil, olive oil... Etc.), test time is 24 hours, check the color, gloss, surface smoothness... Etc., and confirm whether there are bubbles or cracks.
Mechanical test:
Test the strength of PC mechanical structure and wear resistance of key components; Mainly includes vibration test, drop test, impact test, plug test, and wear test... Etc.
Fall test: Free fall on the smooth soil surface from the height of 130cm, each side fell 7 times, 2 sides with total 14 times, PC in standby state and be checked function after each fall.
Repeated drop test: Free drop on the smooth dense surface of 2cm thickness at the height of 30cm, each side fell 100 times with each interval of 2s, 7 sides of total 700 times, PC is in the state of power and be checked function after every 20 times.
Random vibration test: frequency 30 ~ 100Hz, 2G, axial: three axial. Time: 1 hour in each direction and total for hours, the tablet is in standby mode.
Screen impact resistance test: 11φ/5.5g copper ball fell on the center surface of 1m object at 1.8m height and 3ψ/9g stainless steel ball fell at 30cm height
Screen writing durability: more than 100,000 words (width R0.8mm, pressure 250g)
Screen touch durability: 1 million, 10 million, 160 million, 200 million times or more (width R8mm, hardness 60°, pressure 250g, 2 times per second)
Screen flat press test: the diameter of the rubber block is 8mm, the pressure speed is 1.2mm/min, the vertical direction is 5kg force flat press the window 3 times, each time for 5 seconds, the screen should display normally.
Screen front flat press test: The entire contact area, the direction of the vertical 25kg force front flat press each side of the tablet computer, for 10 seconds, flat press 3 times, there should be no abnormal.
Earphone plug and remove test: Insert the earphone vertically into the earphone hole, and then pull it out vertically. Repeat this for more than 5000 times
I/O plug and pull test: PC is in standby state, and the plug terminal connector is pulled out of more than 5000 times
Pocket friction test: Simulate various materials pocket or backpack, the tablet is repeatedly rubbed in the pocket 2,000 times (friction test will also add some mixed dust particles, including dust particles, tobacco particles, fluff and paper particles for mixing test).
Screen hardness test: hardness greater than class 7 (ASTM D 3363, JIS 5400)
Screen impact test: hit the most vulnerable sides and center of the panel with a force of more than 5kg