Shenzhen United Testing Technology Co., Ltd

Thermal Shock   test is used to assess the adaptability of products to the rapid changes of the surrounding environmental temperature. It is an indispensable test in the identification test of equipment design and routine test in the batch production stage. In some cases, it can also be used for environmental stress screening test.    It can be said that the frequency of Thermal Shock   test chamber   is second only to vibration and high and low temperature test in verifying and improving the environmental adaptability of equipment. Common implementation criteria: 1. GJB 150-86 Environmental Test Methods for Military Equipment 2. GB 2423 The Basic Environmental Testing Procedures for Electrical and Electronic Products 3. US Military Standard MIL-STD-810F, Environmental Engineering Considerations and Laboratory Testing Experiment requirements Start temperature requirements Although the general hot and cold impact test standards for the starting temperature of col...

 Voltage drop test items: the voltage temporary drop and short time interruption, the voltage temporary drop and voltage interruption are caused by the failure of the power grid and power facilities or the sudden large changes in the load. Voltage changes are caused by continuous changes in the load connected to the power grid. If EUT cannot respond to the supply voltage, it may cause failure. Definition and detection method of voltage drop: See the instructions in IEC61400-21-2008. Refers to the power supply voltage suddenly drops from the rated value to a certain potential point, which will cause a sudden change in the line current of the electrical equipment, forming potential impact damage, can use the intermediate transformer or converter to limit the impact of electric energy.

The main consideration in the MTBF calculation is the inefficiency of each component in the product. However, because the inefficiency of the devices will be very different under different environments and different use conditions, these factors must be considered when calculating the reliability indicators. These factors can hardly be calculated manually, but with the help of software such as MTBFcal and its huge parameter library, you can easily get MTBF values. During the use of the sound box , in different use environment (some installed outdoors, some carry, some on the ship, etc.), will be affected by different environments (some by wind and rain, some by vibration and fall, some by salt spray, etc.); in order to confirm that the product can work normally in these environments, the national standard and line standard require the product to simulate some test items in the environmental method. Specifically, the MTBF test is the average working time between two adjacent failures, a...

Test requirements T est requirements   of   IEC 60884 Standard are very strict, including but not limited to the following points: Sign and size inspection: check whether the sign of the socket is clear and standard, and whether the size meets the standard requirements. Electric shock protection: test whether the electric shock protection of the socket is effective to prevent accidental contact with live parts. Grounding measures: check whether the grounding measures of the socket are reliable, and whether the terminals and terminals meet the standard requirements. Force required to pull out the plug: test whether the force required to unplug the socket is within the standard range. Insulation resistance and electrical strength: test the insulation resistance and electrical strength of the socket to determine whether its electrical performance is reliable. Temperature rise: test the temperature rise of the socket under normal use conditions. Breaking capacity: test the breakin...

California 65 currently controls nearly 1,000 substances, with no limits for the substances on the list. For enterprises, it is difficult to completely control such a large material situation. In addition, the quarterly update of controlled substances is also one of the difficulties in control. We suggest that enterprises find out the limit requirements of such products in the existing litigation cases according to the product type, and investigate the content of their own products to determine whether they meet the limit requirements of harmful substances in the relevant litigation cases. If the restricted substance exceeds the limit value of the relevant litigation case, the enterprise should put a warning label on the product. At present, California 65 related litigation involves many types of products in electronics and electrical, toys, food contact materials and many other fields.   CP65 certified product range: Electronic products, clothing, food contact products, aluminum c...

IEC 60884 i s an international standard for plug sockets and plug connectors developed by the International Electrotechnical Commission (IEC). The standard is widely used around the world to ensure the safety and interoperability of electrical equipment. Standard overview IEC 60884 The standard covers the design, size and performance requirements of connectors and plug sockets for electrical devices. It puts forward strict requirements for the design and manufacturing of plug socket, including rated voltage, rated current, insulation performance, heat resistance, grounding mode, etc., and stipulates the appearance requirements of plug socket, such as identification, color, material, etc. scope of application IEC 60884 The standard applies to the following types of plugs and sockets: Indoor or outdoor use, household, and similar use. Only used for alternating current, the rated voltage is more than 50V but not more than 440V, and the rated current is not more than 32A. Plugs and fixed o...

The Cyclic Corrosion Test   and The N eutral S alt S pray test   are two different types of salt spray test methods that have significant differences in test conditions, purpose, and application. 1.CCT Definition and purpose The Cyclic Corrosion Test   is a comprehensive salt spray test method, which simulates the complex environmental conditions of the product in practice by combining the neutral salt spray test with constant humidity and humid conditions. This test method not only tests the corrosion resistance of the surface of the product, but also focuses on the corrosion of the product in a wet environment, so as to more comprehensively evaluate the corrosion resistance of the product. The c yclic c orrosion t est   is mainly used for the parts with complex structure and serious corrosion, such as automobile exhaust pipe, frame, oil pipe, etc. Test process The c yclic c orrosion t est   usually involves two cycles of spray and drying for a certain period o...

UL 60335-2-52 is a safety standard published by the The American Underwriters Lab. The standard, issued on April 24,2020, details a range of safety requirements to be met during the design, manufacture and use of oral hygiene devices, including, but not limited to, electrical safety, mechanical safety, thermal safety, chemical safety and use instructions and markings. With the progress of technology and the change of market demand, the UL 60335-2-52 standard will also be timely updated and revised. For example, in the latest version, there may be additional test requirements for battery-powered products, stability tests of handheld devices on charging seats, drop tests, and mechanical strength tests of detachable power components. www.uni-lab.hk/ hofferlau@uni-lab.hk 0755-86180996

The importance of FCC certification FCC Certification is the key to ensuring legal sales of electronics in the U. S. market. For a vacuum cleaner, if it has wireless communication functions (such as wireless remote control, Wi-Fi connection, Bluetooth connection, etc.), it needs to pass FCC certification to ensure that the product will not cause harm to human health and will not interfere with the normal operation of other electronic devices. Main test content of the FCC certification Electromagnetic compatibility (EMC) test: Check whether the vacuum cleaner will cause electromagnetic interference to other electronic devices under normal working state, or whether it will suffer from electromagnetic interference from other electronic devices. Test items include electrostatic discharge (ESD), radiation emission (RE), radiation resistance (RS), electromagnetic sensitivity (EMS), etc. RF test: Check in the process of vacuum cleaner, whether it will be harmful interference to the radio freq...

1. GB / T 6461–2002 Rating of specimens after corrosion test of metal and other inorganic overlays on the metal substrate; 2. ISO 10289–1999 Rating of test samples and components of metal and other inorganic overlays on metal parts. Salt spray test is an accelerated test that takes only a few days, or even hours, to detect how corrosive the power adapter is. Although the salt spray test is an effective test method. However, due to many factors affecting corrosion, a single salt spray resistance performance cannot be used as a representative of the performance of other media, so the salt spray test results cannot be used as a direct guide for the corrosion resistance of the tested materials in all environments. The performance of simultaneous materials in tests cannot be used as a direct guide for corrosion resistance in use. Nevertheless, the salt spray test method can still be used as a method to test the test material. www.uni-lab.hk/ hofferlau@uni-lab.hk 0755-86180996