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  • Electrical testing of PCB
     
    Date :2017-8-17

     

    First, the electrical test
    In the production process of electronic products, due to defects caused by loss cost, at all stages has a different degree, sooner found that the lower the cost of remediation. Electrical testing for the PCB industry, in order to early detection of line defects in the board. The test conditions and test method mainly includes source and test data format, test conditions, such as voltage, current, insulation and connectivity, devices and production methods selected point, chapter test, repair specifications. In the PCB manufacturing process, the three stages of the test must be made after the inner layer is etched, the outer line is etched after the finished product.

     

    Second, the electrical measurement methods and equipment
    Electrical testing methods are: special type, universal type, flying needle type, non-contact electron beam, conductive cloth, capacitive and brush test, one of the most commonly used equipment, are dedicated testing machine, universal test Machine and flying probe test machine. In order to better understand the functions of various devices, the following will compare the characteristics of the three main equipment.
    1, special type test
    The reason for the special type of special type of test, mainly because they use a rule only applies to one item number, item number of different board can not be tested and can not be recycled.
    2, universal test
    The basic principle of generic test is that the layout of the PCB line is based on the grid design, the hole position to a G10 substrate for the Mask, only the location of the probe in the hole to pass through the Mask for electrical testing, so the rule of the production of simple And fast, and the probe can be reused. Extensive test points are usually more than 10,000 points, test the density of the test or called on-grid test, belonging to the off-grid test, the fixture must be specially designed, usually universal test test density can be Up to QFP.
    3, flying probe test
    Flying probe test principle is very simple, requiring only two probes for x, y, z individually tested by movement of the two end points of each line, and therefore no additional production expensive jig. But because it is end point test, so the speed is very slow.

     

    Third, the technical comparison
    Flying needle test is the most suitable for small-scale production and sample of electrical testing equipment, but to be used in a large number of production, due to slow speed and equipment is expensive, will make a substantial increase in test costs, dedicated-use and no matter what level for the board, as long as the output reaches a certain number, the standard test cost can reach economies of scale, but only about 2 to 4% of the price. But with the electronic product changes faster, making a single circuit design version of the product life cycle shorter. Currently under active modified E-Beam, CEM or plasma discharge technology, if promotion in the test efficiency, will be a good and viable solution on electrical testing.

     

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