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1. Dielectric Voltage withstandtest
High voltage test is a required test item required by the international safety certification agency. The product must be tested at the factory's front seat percentage. It is a quality assurance and electrical safety indicator for products. The abnormal voltage at the normal operating voltage is added to the product for testing, and this voltage must last for a period of time. Finally, as long as there is no insulation breakdown, it can be considered to pass this test
2, Insulation resistancetest
Insulation resistance applies a DC voltage to the relevant two points, up to 1000 volts, the unit is usually ohms, and good and bad products can be judged
3 Ground Bondtest
The grounding impedance test is to test the grounding point of the product. Apply a constant current power supply to the shell or metal part of the product to test the impedance between the two points. The general product stipulates that the test is 25 amps, and the impedance should not be greater than 0.1 ohm, while CSA requires Measured at 40 amps, it can detect problems that the grounding point screw is not locked, the diameter of the grounding wire is too small, and the grounding circuit is broken.
4. Touch current test
Refers to the current flowing through the metal contactable part of the device through the human body to the grounded part or contactable part when the device supplies current.
5. Input test:
The purpose of safety input test is to investigate whether the input meets the current required by the product when the product meets the normal operation of the product during the product design. The product standard stipulates that: the input current of the maximum power consumption cannot be greater than 110% of the nominal value of the product. This nominal value also tells the user the minimum current required for the safe operation of the product, allowing the user to prepare such an electrical environment before using this device.
6. Stability test of safety signs:
The safety warning signs for users must be stable and reliable. They cannot be ambiguous after being used for a period of time, which can cause the user to use them erroneously, resulting in danger, or directly causing danger. So you need to test this stability. The safety standards stipulate that: use water test for 15S, and then use gasoline test for 15S, and the logo should not be ambiguous.
7. Capacitor discharge test:
For a device that can be plugged and unplugged, the power cord is often pulled out of the socket, and the power plug of the socket is often unplugged. It is often played by people or placed randomly. This leads to a problem, when the unplugged power plug is live, and the power disappears with time, if this time is too long, it will cause electric shock to the plug player, and any power plug will damage other equipment Or the device itself. Therefore, the safety standards of the whole machine make strict regulations on this time. We need to consider this time when designing products, and this time needs to be measured for product safety certification.
8. Circuit stability test:
SELV circuit
The SELV circuit is a safe ground voltage circuit. This circuit is safe for people, such as the DC output terminal of the mobile phone charger, to the mobile phone. They are safe and can be touched without any danger.
Note: The SELV circuit has different interpretations in different standards. For example, the interpretation in IEC60364 is different from IEC60950-1, so it is necessary to pay attention to which standard under SELV, and the danger is also different.
The SELV circuit needs to meet special requirements to be a SELV circuit. These requirements are that, in the case of a single fault, the requirements of the SELV circuit are still met. Therefore, each SELV circuit needs to be tested under a single fault, which proves that the SELV circuit is stable. During the test, single faults are introduced one by one to monitor the SELV circuit.
9 、 Limited power source circuit
Since the output power of the power-limiting power source circuit is very small, in the known experience, they will not cause a fire hazard. Therefore, in the safety standard, the shell of this type of circuit has been specifically reduced requirements, their flame retardant rating is UL94V -2. Therefore, all these circuits need to be measured to prove that they are power-limited power circuits.
10. Current limiting source circuit
People who have worked with electricians know that after a certain resistance is passed through the AC220V circuit, there is no danger to people. So what is the resistance, and what are the requirements of the resistance. Maybe you do n’t know. There is this regulation in the safety standard. This regulation is the current limiting source circuit. Current-limiting source current requires that under normal circuit conditions and single faults, the outgoing current is below the safe limit, which will not cause danger to people less than 0.25mA. The resistance for isolating the primary and secondary circuits is the impact resistance required to meet specific standards.
11, grounding continuous test:
People who have done electrical installation know that some equipment must be grounded, otherwise there will be dangerous voltage on the surface that can be touched. These dangerous voltages must be discharged through ground. The safety test stipulates how much current needs to be used, how long, the measured resistance must be less than 0.1 ohm, or the voltage drop is less than 2.5V (use this value conditionally).
12 、 Moisture test:
No humidity test is to simulate the safety performance of the equipment under extreme tightness. After the equipment is manufactured, it can be safely operated under any humidity. It cannot be used to tell users that the equipment cannot be used because it is rainy season and the humidity is high. Therefore, the design must consider that the equipment meets the safety requirements under the foreseeable humidity, so the humidity test is necessary. The test requirements are based on different standards and there are a few differences.
13. Torque test:
Torque test is that the external wires of the device are often bent and deformed by external force during use. This test is the number of bends that the test wire can withstand. It will not break due to external force during the product life cycle, and the AC220V wire is exposed and other hazards.
14. Stability test:
In normal use, the equipment often has different external forces, such as: people with higher equipment will lean on it, or someone will climb it during maintenance; shorter equipment, with a shape like a stool, may stand Wait above. Due to the external force of the equipment, the equipment is not considered in the design will cause the equipment to collapse, overturn and other dangers. Therefore, these tests need to be done after the device design is completed. Check that they meet safety requirements.
15. Shell stress test:
The device will be subjected to various external forces during use. These external forces may deform the device casing, which may cause danger inside the device, or the indicators cannot meet the requirements. Therefore, these effects must be considered when designing equipment, and these indicators must be tested during safety certification.
16. Drop test:
Small equipment or desktop equipment, in normal use, may fall from the hands or workbench to the ground. These drops may cause the internal safety indexes 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. Stress release test:
If there is a dangerous circuit inside the device, the device is in normal use, and if the casing is deformed, resulting in dangerous exposure, this is not allowed. Therefore, these effects must be considered when designing the equipment, and these indicators must be tested during safety certification.
18. Battery charge and discharge test:
If there is a rechargeable battery inside the device, you need to do charge and discharge test, and charge test and overcharge test under single fault. This is because the device is in normal use, charging and discharging, and the device is faulty, but the main function has not been lost, and the user will not find the device fault. In this case, the discharge and discharge requirements are safe and cannot occur. Explosion and other dangers.
19. Equipment heating test:
(Temperature of internal and external surfaces under normal operation)
In the safety test, the temperature rise test is the most important. Although the equipment used in the test is the same as the artificial climate environment test, the test items and test devices and purposes are very different. The artificial climate environment mainly examines the adaptability and reliability of the equipment. The safety regulations investigate whether the equipment can work safely. Here is an example to illustrate their differences: Safety testing mainly tests the temperature of safety devices, such as the operating temperature of insulating materials under normal conditions. This temperature is less than the maximum allowable temperature of insulating materials at the highest allowable operating temperature of the equipment. If the temperature of the insulation material tested in a 25 ° C environment is 100 ° C, and the insulation material can only be safely operated below 130 ° C, this is critical to define the maximum operating temperature allowed by the equipment. If the equipment is at an ambient temperature of 50 ° C, the insulation material The test temperature converted to an ambient temperature of 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, then the test temperature converted to an ambient temperature of 60 ° C should be 135 ° C, which is greater than 130 ° C and the test fails. Similarly, other safety devices also need to test the operating temperature. To determine whether the requirements are met.
20 、 Ball pressure test:
As an insulating material or plastic part supporting dangerous voltage, a ball pressure test is required to ensure that the plastic part has sufficient supporting strength when the dangerous voltage component is operated at high temperature. The test temperature is the highest temperature plus 15 ℃, but not less than 125 ℃. The ball pressing time is kept at 1H at the required temperature.
  standard test:
GB8898, GB4943, GB4706…., IEC / EN62368, IEC / EN62133, IEC / EN60335, IEC / EN61558, UL62368, UL1310, UL8750…
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