Printed circuit boards, also known as printed circuit boards, are providers of electrical connections for electronic components. Printed circuit boards are often referred to as' PCB 'rather than' PCB board '. The design of printed circuit boards mainly involves layout design; The main advantage of using circuit boards is that they greatly reduce wiring and assembly errors, improve automation level and production labor rate. Printed circuit boards can be divided into single panel, double-sided board, four layer board, six layer board, and other multi-layer circuit boards according to the number of circuit board layers. Due to the fact that printed circuit boards are not general end products, the definition of their names is somewhat confusing. For example, the motherboard used in personal computers is called the motherboard, and cannot be directly referred to as a circuit board. Although there are circuit boards in the motherboard, they are not the same. Therefore, when evaluating the industry, it cannot be said that the two are related. For example, because there are integrated circuit parts loaded on the circuit board, the news media refers to it as an IC board, but in essence, it is not equivalent to a printed circuit board. The printed circuit board we usually refer to is a bare board - a circuit board without any upper components
Classification
Single panel
On the most basic PCB, parts are concentrated on one side and wires are concentrated on the other side. Because wires only appear on one side, this type of PCB is called a single side. Because single panels have many strict restrictions on the design of wiring (as they only have one side, wiring cannot cross and must be routed independently), only early circuits used such boards
Double sided board
This type of circuit board has wiring on both sides, but to use wires on both sides, it is necessary to have appropriate circuit connections between the two sides.
. The "bridge" between these circuits is called a guide hole (via). A guide hole is a small hole filled or coated with metal on a PCB that can be connected to wires on both sides. Because the area of the double-sided board is twice that of a single panel, the double panel solves the difficulty of staggered wiring in a single panel (which can be connected to the other side through guide holes), making it more suitable for use in more complex circuits than a single panelMulti layer board
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