When designers choose components, they often only pay attention to their functions and performance, but not to their quality and reliability levels. They don't know the particularity of different components in application and related precautions. Purchasing personnel are not familiar with the quality and reliability level of components, and only purchase according to the conventional performance requirements of components. The procurement channels of imported components are not smooth, and their quality and reliability cannot be guaranteed. Affected by the one-sided pursuit of profit, some manufacturers leave many components without inspection and screening, and some still cut corners.
Some units have not established a complete component quality control mechanism and effective control methods. Incorrect use of components. The purpose and screening situation of component screening, the screening test of component screening purpose can be conducted at different levels such as components and semi-finished system components. In order to find and eliminate inherent defects of components, the initial screening should be performed at the component level. The role of component screening is to intentionally apply basic environmental stress to the components according to a certain method before the components are installed, so as to cause early failure and eliminate unqualified products, thereby improving the reliability of the product and reducing the cost of use and maintenance.
The relationship between component defects and their quality grades, due to the different quality grades of components, the failure rate of different components working under the same conditions will vary by orders of magnitude. Moreover, the main difference between S-level and C-1-level components is the visual inspection, process control level, component screening and electrical test that these components have undergone. From the statistical data of recent years, the elements that meet the technical requirements Devices, the best can reach 98%, none of the worst batch is qualified, so the quality of components is not as good as some people think.
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