PCB is the abbreviation for Printed Circuit Board (PCB) in English. It is usually referred to as a conductive pattern formed by predetermined design, plate making, printed circuit, printed components, or a combination of both on an insulating substrate. The conductive pattern that provides electrical connections between components on an insulating substrate is called a printed circuit. In this way, printed circuits or finished boards of printed circuits are called printed circuit boards, also known as printed boards or printed circuit boards. So FCB plays a role in integrating and connecting all its functions in the entire electronic product. Therefore, when electronic products malfunction, the first question often comes from PCB. PCB must be strictly controlled during the production process, and the testing program is also carried out at the same time. After the product is manufactured, there must also be testing. If it can be repaired according to the standard after testing, enter the PCB repair program: if it cannot be repaired, it is classified as a defective crystal. PCB testing is of great significance in providing the yield of final electronic products. 1. Appearance and size inspection of PCBs 11. Appearance inspection of printed boards should use the following intuitive methods to inspect whether the markings, graphics, and surface coating of printed boards comply with relevant specifications when enlarged or not. A Visual inspection method: Visual inspection with the naked eye without being exposed to large light conditions: E Calibrator 3 Information: Visual inspection with a 3x linear magnifying glass under appropriate lighting conditions, C Magnification 10 times: When specified, visual inspection with a 10x linear magnifying glass under appropriate lighting conditions: D Magnification 250 times: When specified, Using a 250x microscope for inspection Commonly used for self inspection of fiber boundaries. 12 Dimensional inspection includes the inspection of dimensions in various parts such as appearance, thickness, holes, hole positions, ring width, wire width, and wire spacing, wire gaps, metal residues, printed plugs, etc. 121 Dimensional inspection includes the inspection of rectangular, circular, and irregularly shaped edges of printed boards. Tools: Dense gauge calipers with a measurement accuracy of not less than 10 arm or other applicable measuring tools: measurement accuracy is not small A radius gauge or other suitable measuring device for Sm, such as a universal angle ruler with a measurement accuracy of not less than s. Lake volume: Use prescribed tools to measure side lengths, radians, and angles. 122 Thickness detection tool: A micrometer or other suitable measuring tool with a precision of no less than Dimm. Measurement: Measure the thickness of any part with printed wires or coating on a printed board. The printed plug area should be reasonably selected with 3 or more measuring points to measure its thickness
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