The circuit board designs testability technology
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The definition of the plate making testability of the circuit board can be interpreted briefly as: The circuit board testing engineer should use the simplest method to test as much as possible while measuring the characteristic of a certain component, in order to confirm whether this component can reach the anticipated functional requirement. Further meaning is:
Does 1 find to what extent method whether products accord with the technical regulation simplifies
To what extent does 2 work out the test procedure Yes fast
Does 3 find to what extent trouble of products melt in an all-round way
To what extent do 4 methods to insert the test point simplify
In the past,if one product in at there can’t test is one test point. If the defect of the products can’t find, recognition and diagnosis of this defect will be passed to function and system testing briefly in production test.
On the contrary, people attempt to find the defect ahead of time as much as possible today, its advantage is not merely low cost, the more important thing is today’s products are very complicated, some manufacturing defects may not be checked in the functional test out at all. For example some wants the component containing software or programming in advance, there is such a problem. (Such as flash memory or ISPs: In-System Programmable Devices intrasystem programming device) . The programming of these components must have been mapped out during the course of developing, must grasp this kind of programming in and the test system.
It is tested that friendly PCB circuit design takes some money, however, it is tested that there will be more money of the difficult circuit design charges. Test itself a one with cost, it is tested that the cost is strengthened as test the increase of progression; From on-line test to functional test and system testing, the testing expenses are larger and larger. If jumped over a test among them, it will even be bigger to consume and use. It is 10 times that the general rule increases the increase coefficient of the first class testing expenses each time. The intersection of Pass The Test and friendly the intersection of PCB and circuit design, can find trouble early, thus make, test friendly the intersection of PCB and circuit design money of fee compensate rapidly.
Certainly, must consider the machinery and design rules of the electricity in order to reach the good one testably. Demand certain cost, but for whole technological process, it has a series of advantages, so is the important prerequisite whether the products could succeed in producing.
