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Mobile phone Party -- must know ten mobile phone test items!
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Mobile phone Party -- must know ten mobile phone test items!
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How much do you know about the test items of mobile phone? The following is a brief introduction by Zheng hang instruments
1、 High and low temperature damp heat test—— High and low temperature humidity and heat test box
High / low temperature makes the mobile phone in different temperature environment to test the adaptability of the mobile phone. The low temperature ? ? test is generally at - 20 ℃ and the high temperature is about 80 ℃. At present, some mainstream mobile phone manufacturers choose the rule of high and low temperature: high temperature and high humidity, 80 ℃ or so, and 90% humidity is added; for low temperature, some manufacturers achieve - 35 ℃.
2、 Pressure test:
Make 1000 calls to the mobile phone continuously with the automatic test software to check whether the mobile phone will fail. If something goes wrong, the software needs to be rewritten. Therefore, sometimes different software versions exist on the mobile phone. In fact, we can tell you a secret. The more versions of the mobile phone are, this can prove that the mobile phone has not been fully tested before it is launched for sale.
3、 Fall resistance test:
Drop resistance test is a special mobile phone drum drop, fall resistance test will use the following test machine: drop tester reliability laboratory to carry out, 0.5m micro drop test to do 300 times / face (mobile phone has six sides). The 2m drop test needs to be done once for each side, and the mobile phone is also thrown to the desktop by imitating a real person. The battery used in the mobile phone should pass through a height of at least 4m, and it should fall 100 times to the ground without any rupture.
4、 Corrosivity test—— Compound salt spray chamber test
At present, a special compound salt spray test chamber is used, and a special cabinet is used to test the dripping water. It takes about 30 hours to simulate the sweating situation of a real person (a certain proportion of salt is infiltrated into the water). High humidity test, generate high humidity salt fog, strong corrosion of mobile phone metal accessories.
5、 Baige test (also known as boundary tofu test)
Use a pencil of H4 hardness to draw 100 squares on the shell of the mobile phone to see if the paint will fall off. For some mobile phones with more stringent requirements, some "famous brand" cosmetics will be applied on the shell of the mobile phone to see whether the paint of the mobile phone will produce peculiar smell or drop due to different chemical components.
6、 Torque test:
Clamp the two ends of the straight machine, one to the left and the other to the right. The torque test is mainly to test the strength of the mobile phone shell and the inside of the mobile phone.
7、 Static test:
Static electricity in northern China, the weather is relatively dry, touching metal things is easy to generate static electricity, which can cause breakdown of the circuit of mobile phones. Some poorly designed mobile phones are suddenly damaged in this way. The tool for this kind of test is a copper plate called "electrostatic gun". The electrostatic gun will be adjusted to 10-15kv high voltage and low current condition, and discharge test will be conducted on all metal contact points of mobile phone. The time is about 300ms-2s, and it is carried out in a room with humidity control. The relevant charger (huoniu) will also have the same test, which can only be sold after passing the test.
9、 Sand (sand) dust test -- sand and dust resistance test box:
Put the mobile phone into a specific box, the fine sand is blown by the hair dryer. After about three hours, open the mobile phone and check whether there is sand inside the mobile phone. If so, the airtight design of the mobile phone is not good enough, and its structural design needs to be readjusted.
10、 There are also tests on the reverse connection of the charger / battery to see whether the protection circuit design of the mobile phone can work normally, the test of calling near the fluorescent lamp, the test of the proportion of electromagnetic wave absorbed by the human body, and the test of calling near the cardiac pacemaker.
The tests mentioned above are indispensable. When the iron wire is used to dial the bottom connector of the mobile phone, it is mainly to consider whether there will be a short circuit of the mobile phone if there is a key in the handbag. In addition, the mobile phone test also includes more strange test items, such as placing the mobile phone on an iron plate and making a phone call. Because the magnetic field changes at this time, everything will happen, such as no SIM card can be found.
The above mobile phone test projects are basically the major well-known mobile phone manufacturers will strictly implement!