Date：2022-04-18 15:13:50

The components damaged by overvoltage can not see obvious specific changes from the surface, but the parameters have changed. When it is more serious, the circuit board around the components turns yellow and black. Devices are the most easily damaged items, but their faults are regular. General faults are divided into two types: electrical parameter damage and physical damage. Then the damage of electrical parameters includes the damage caused by voltage and current exceeding the rated value. Physical damage includes fracture, deformation, resistance parameter change and other manifestations. What are the phenomena of component damage? The life of electronic components is not only related to its own structure and properties, but also closely related to its service environment and its role in the circuit. View >>

Date：2022-04-18 15:08:21

What does the meaning of halogen-free and halogen-free plates in PCB plates mean? To put it simply, halogen plates are not environmentally friendly, while halogen-free plates are relatively environmentally friendly. The simplest way is to slice them and analyze them. Halogen is a non-metallic element of group VII a, which includes five elements: Fluorine -, chlorine, bromine, iodine and astatine. Astatine is a radioactive element, and halogen is usually referred to as fluorine, chlorine, bromine and iodine. View >>

Date：2022-04-18 15:04:31

How does the factory detect the aging of electronic components? Aging, also known as "sophistication", refers to the continuous application of certain electrical stress to components under a certain ambient temperature and for a long time, through the comprehensive action of electrical and thermal stress to accelerate various physical and chemical reaction processes inside components and promote the early exposure of various potential defects hidden inside components, so as to achieve the purpose of eliminating early failure products. View >>

Date：2022-04-15 17:12:40

The enterprise applies for ISO quality management system, AAA enterprise credit, environment and occupational health management system certification in a third-party certification body. Many enterprises find that there is no CNAs mark on some certificates when they find a third-party organization for testing. So, is the certificate without CNAs invalid? What is the difference between a certificate with a CNAs mark and a certificate without a CNAs mark? View >>

Date：2022-04-15 17:07:00

When interconnected or close to each other, all electrical equipment or devices endanger each other, such as the influence between TV, GSM mobile phone, tape recorder and surrounding automatic washing machine or cable. The purpose of electromagnetic compatibility testability (EMC) is to control all such adverse reactions in an effective range. EMC measurement mainly includes test field and test instrument, which is one of the important indexes of product quality. View >>

Date：2022-04-15 17:04:17

XRF refers to the X-ray fluorescence spectrometer, which can quickly and simultaneously determine multiple elements. Under X-ray excitation, the inner electron of the tested element atom undergoes energy level transition and emits secondary X-rays (X-fluorescence). Observing and describing X-rays from different angles, XRF can be divided into energy scattering X-ray fluorescence spectrometer, abbreviated as EDXRF or EDX, and wavelength scattering X-ray fluorescence spectrometer, abbreviated as WDXRF or WDX, but EDX is widely used in the market. WDX is separated by crystal, and then the diffracted characteristic X-ray signal is received by the detector. View >>

Date：2022-04-15 16:52:33

XRF test is one of the commonly used tests. People usually call the secondary X-ray generated by X-ray irradiation on substances as X-ray fluorescence, and the X-ray used for irradiation as primary X-ray. So X-ray fluorescence is still X-ray. View >>

Date：2022-04-15 16:42:00

CMA is the abbreviation of China Metrology Accreditation. Only the third-party inspection organization with CNAs certification is allowed to apply CMA chapter on the inspection report, and CMA can be applied on the inspection certificate report according to the new items allowed on the qualification certificate. The test report with CMA seal can be used as a product quality evaluation, effectiveness and appraisal institution, which is legally recognized. Cmacnas certification and CNAs laboratory identification, as common verification of inspection reports, have not only common points but also some differences. View >>

Date：2022-04-12 14:02:30

PCBA (PCB assembly) refers to the process of mounting, inserting and welding the bare PCB board. The circuit boards we usually see are welded with components on the basis of PCB, namely PCBA, and PCB is "bare board" and "light board". Generally speaking, PCBA reliability test is divided into ICT test, FCT test, fatigue test, simulated environment test and aging test. Because the problem of any material will affect the overall result of PCBA board, which requires us to have sufficient material detection ability, supplier management ability, technical analysis ability and reliability testing ability. View >>

Date：2022-04-12 13:58:00

The quality of chip mainly depends on market, performance and reliability factors. Firstly, in the early stage of chip development, the market needs to be fully studied to define the spec to meet the needs of customers; The second is performance. The circuit designed by IC design engineers needs to pass designer simulation, DFT circuit verification, laboratory sample evaluation and FT, and it is considered that the performance meets the requirements of early definition; The last is reliability. Because the test chip can only ensure that the customer gets the sample for the first time, a series of stress tests need to be carried out to simulate the impact of some strict service conditions on the chip, so as to evaluate the service life and possible quality risk of the chip. View >>