Date：2022-05-16 15:34:51

Since 2009, China National Accreditation Commission for conformity assessment (CNAs) has carried out special supervision over laboratories and inspection institutions (hereinafter referred to as laboratories), and also organized a large number of complaint investigations during this period. Since 2014, CNAs has continuously issued 8 issues of typical cases of problems found in the laboratory through special supervision and complaint investigation, which has had a good warning effect on the accredited laboratory. View >>

Date：2022-05-16 15:20:00

The European Parliament and the European Council adopted ROHS directive in January 2003, the full name of which is the restriction of the use of hazardous substances in electrical and electronic equipment, that is, the directive on restricting the use of certain hazardous substances in electronic and electrical equipment, also known as 2002 / 95 / EC Directive. In 2005, the EU supplemented 2002 / 95 / EC in the form of 2005 / 618 / EC resolution, which clearly stipulates the maximum limit values of six hazardous substances. The standard has been officially implemented on July 1, 2006, mainly using View >>

Date：2022-05-16 15:13:00

ROHS testing only appears as an instruction. It is not a standard law and regulation, so it is not mandatory. However, if the product is tested with ROHS, it will greatly increase the credibility of the product and improve the value of the product. It is recommended to do ROHS testing. RoHS directive originated in the European Union, with the rise of the production and use of electrical and electronic products (also known as EEE). During the use, handling and disposal of environmental electrical equipment, harmful substances (such as lead and cadmium) may be released, resulting in serious environmental and health problems. RoHS helps prevent such problems. It limits the existence of specific harmful substances in electrical products, and safer alternatives can replace these substances. View >>

Date：2022-05-16 15:03:16

RoHS is a mandatory standard formulated by EU legislation. Its full name is the restriction of hazardous substances. The standard has been officially implemented since July 1, 2006. It is mainly used to standardize the material and process standards of electronic and electrical products, so as to make it more conducive to human health and environmental protection. View >>

Date：2022-05-16 14:49:16

Notice on Issuing cnas-rc04:2022 administrative rules for accreditation fees of certification bodies View >>

Date：2022-05-16 14:33:48

Notice on Issuing CNAs approved charging items and standards (version 2022) View >>

Date：2022-05-13 14:44:26

Solder joint reliability is usually a pain point in electronic system design. Various factors will affect the reliability of solder joints, and any one of them will greatly shorten the service life of solder joints. As the solder joints in the circuit board become smaller and smaller, and the mechanical, electrical and thermodynamic loads they carry become heavier and heavier, the requirements for stability are also increasing. However, the problem of PCBA solder joint failure will also be encountered in the actual processing process. It is necessary to analyze and find out the cause to avoid solder joint failure again. There are many common welding defects on circuit boards. The following describes the common welding defects, appearance characteristics, hazards and cause analysis in detail. View >>

Date：2022-05-13 14:40:00

Destructive physical analysis, abbreviated as DPA. It is to randomly select an appropriate number of samples in the production batch of components, and use a series of non-destructive and destructive methods to test whether the design, structure, material and manufacturing quality of components meet the intended purpose and relevant specification requirements. And whether it meets the reliability and supportability specified by the components, dissect the component samples, and conduct a series of inspection and analysis before and after dissection. It is used to determine whether there may be quality problems of component batches that endanger the use and lead to serious consequences. View >>

Date：2022-05-12 15:23:44

Welding is a non detachable connection method. It is a process in which two or more same or different materials are connected into one through the combination and diffusion between atoms or molecules. Welding can use filler materials or no filler materials, which can be applied to the connection of metal and non-metal. The following is a brief analysis of the precautions for each step of manual welding for your reference. View >>

Date：2022-05-12 15:21:09

There are more and more refurbished materials for electronic components on the market. How to identify the authenticity of electronic components? Counterfeit components refer to electronic components with unknown source or defective quality. Nowadays, the proliferation of counterfeit electronic components has become a major pain point in the component industry. How to distinguish whether the purchased components are counterfeit? When we buy chips, we must be careful. Counterfeit components are usually recycled components, cloned (imitated), overproduced, substandard, defective components and components with tampered description information. Such components will produce serious hidden dangers, and the tampered information in the chip may damage the function of the whole system. Electronic component testing is the application of testing service industry technology in electronic information industry, and it is an important part of the specific industrial chain of electronic components View >>