PCB News - Introduction to the continuity test method of PCB copy board

PCB copy board is widely used in electric test needle bed type tester, divided into two types of general and special types. The general structure of the continuity tester is complex, the matrix test needle bed, the equipment is expensive, but the lamp manufacturing is relatively simple, the cost is low, and the small and medium batch test is suitable. The special switch testing machine has simple structure, test speed, equipment, low price and high production cost fixture, which is suitable for mass PCB testing. A production plant acquisition in general? 2 universal testing machines and several external test types.

High-density surface mount is printed with more and more dense needle density beds, and the pitch of QFP package is reduced to O.30mm, 0.25, O.20mm or even 0.10mm.Circuit boards appear. With so many tests and dense needles, the difficulty is getting bigger and bigger, and the cost of the needle bed is more expensive. Therefore, for those high-density questions: family planning and BGA board graphics, if the center distance between the test points is only 0.1 mm, the position of the flagpole has been difficult to determine when the conductive rubber block can be used for local testing.

In addition, the actual application of current detection technology also includes non-stop rebirth-02 flying probe test. Especially in recent years, the British and American PROBOT companies such as BSI have launched mobile probe test systems that no longer use needle beds, and there is no need to create test devices. Just move the test probes on both sides of the circuit board under test. Or more than two mobile test probes. The system is interfaced with computer, computer-aided design, and CAD design data can be used to drive the test. There is no comparison test. It is up to O.10mm. The equipment cost is lower. Compared with the needle bed universal testing machine, it has high density and appropriate low test spacing. test. In addition, the new development of the test technology of the capacitance test method with the bare board closed, and there is no electron beam test method with mechanical contact.

The above is the introduction of the continuity test method of PCB copy board. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.