Testing Lab of Power Supply/ IT / AV Products

Last week, the editor introduced the top ten test items of safety testing to you. This week, I will continue to introduce the remaining safety certification test items for you. Follow the steps of the editor to learn about it together!

11. Ball pressure test

As a support for insulating materials or plastic parts with dangerous voltage, it is necessary to do a ball pressure test to ensure that the plastic parts have sufficient supporting strength when the dangerous voltage parts work at high temperatures. The test temperature is the maximum temperature plus 15°C, but not less than 125°C. Ball pressure time is maintained at the required temperature for 1H.

12. Wet test

The humidity test is to simulate the safety performance of the equipment under extreme ring tightness. After the equipment is manufactured, it can operate safely in any humidity, and users cannot be told that the equipment cannot be used because it is the rainy season and the humidity is high. Therefore, it must be considered in the design that the equipment meets the safety requirements under the foreseeable humidity, so humidity testing is a must. There are small differences in test requirements according to different standards.

13. Torque test

Torsion test is that the external wire of the equipment is often bent and deformed by external force during use. This test is the number of bends that the test lead can withstand. It will not break due to external force during the product life cycle, and the AC220V wire will be exposed and other dangers.

14. Stability test

In the normal use of the equipment, there are often different external forces, such as: relatively tall equipment people will lean on it, or someone will climb it during maintenance; relatively short equipment, the shape is like a stool, some people may stand Wait on it. Because the equipment is subjected to these external forces, the equipment is not designed with careful consideration, which will lead to the danger of equipment collapse and overturning. Therefore, these tests need to be done after the device design is completed. Check that they meet safety requirements.

15. Shell force test

During the use of the equipment, it will be subjected to various external forces. These external forces may deform the equipment shell. These deformations may lead to dangers inside the equipment, or the indicators cannot meet the requirements. Therefore, these effects must be considered when designing equipment, and these indicators must be tested for safety certification.

16. Stability test of safety signs Drop test

Small or tabletop equipment may fall to the ground from the hand or table during normal use. These drops may cause the internal safety indicators of the device to fail to meet the requirements. Therefore, this effect must be considered when designing equipment, and these indicators need to be tested during safety certification. The requirement is that after the device falls, the function can be lost, but it cannot cause danger to the user.

17. Capacitor discharge test: stress release test

If there is a dangerous circuit inside the device, and the device is in normal use, if the shell is deformed, resulting in dangerous exposure, this is not allowed. Therefore, these effects must be considered when designing equipment, and these indicators must be tested for safety certification.

18. Battery charge and discharge test

If there is a rechargeable battery inside the device, a charge-discharge test, a single-fault charging test and an overcharge test are required. This is because the equipment is in normal use, charging and discharging, and the equipment is faulty, but the main function has not been lost, and the user will not find the equipment fault. In this case, the charging and discharging requirements are safe and cannot be caused by this. Danger of explosion, etc.

19. Equipment temperature rise test

In the safety test (the temperature of the internal and external surfaces under normal operation), the temperature rise test is the most important. Although the test equipment and instruments are the same as the artificial climate test, the test items, test devices and purposes are very different. The artificial climate environment mainly examines the adaptability and reliability of the equipment. The safety regulations examine whether the equipment can work safely. Here is an example to illustrate their differences: the safety test mainly tests the temperature of the safety device, such as the working temperature of the insulating material under normal conditions, which is lower than the maximum allowable temperature of the insulating material at the highest allowable working temperature of the equipment.

For example, the temperature of the insulating material is 100 ℃ in the 25 ℃ environment, and the insulating material can only operate safely below 130 ℃, which is the key to define the maximum operating temperature allowed by the equipment. If the equipment is at an ambient temperature of 50 ℃, then the insulating material The ambient temperature test temperature converted to 50°C should be 125°C, which meets the requirement of less than 130°C and the test passes. If the ambient temperature of the device is 60°C, the test temperature of the ambient temperature converted to 60°C should be 135°C. If it exceeds the requirement of 130°C, the test fails. Similarly, other safety devices also need to be tested for operating temperature. to determine whether the requirements are met.

20. Grounding continuity test

After the AC220V circuit passes through a certain resistance, there is no danger to people. So what is the resistance, and what are the requirements for the resistance. Maybe everyone doesn't know. There is this regulation in the safety standard, and this regulation is the current limiting source circuit. Current-limiting source current requires that under normal circuit and single fault, the outgoing current is below the safety limit, and it will not cause danger to people and be less than 0.25mA. Resistors for isolating primary and secondary circuits are shock-resistant resistors that are required to meet specific standards.

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