Printed circuit board components belong to the second and third level assembly (see electronic assembly level), and there are two assembly methods Flat or two-dimensional assembly: Components and devices are installed on a flat surface (Figure 1) and interconnected using printed circuit boards. In order to improve assembly density, components and devices can be installed on both sides of the printed circuit board, or a layer of metal plate can be sandwiched between the printed circuit board to improve cooling capacity Modular assembly or three-dimensional assembly: In order to improve assembly density, two parallel printed circuit board components are generally used to form a space, where components and devices are installed, or on the front and back sides of the printed circuit board. The boards are connected to each other using cables or connectors; Similar to bridging, the legs of components and devices can be respectively supported on two printed circuit boards, known as sandwich modules (Figure 2). The structural design of printed circuit board components must consider issues such as circuit zoning and standardization, assembly type, reasonable layout of components and devices, assembly structure, cooling method, and mechanical dynamic characteristics.
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China