Circuit board flying probe test introduction

Circuit board flying probe test introduction

       The advent of flying probe testing for circuit boards has changed the testing methods of low-yield and quick-turn assembly products. Testing that used to take several weeks to develop can now be done in just a few hours. For the severe time to market (time -Electronic manufacturing service (EMS, flying probe" test under to-market pressure is the latest solution to some of the main problems of the test. The source of the name is based on the functionality of the device. ElectronManufacturServic provider, this back-end capability greatly Front-end technologies and processes that compensate for time savings, such as continuous flow manufacturing and just-in-tim logistics.

      Depends on interconnection technology and board density. Customers are often willing to pay a little extra for this kind of expression. However, when the circuit board has been assembled but cannot be tested within an acceptable time frame, the advantage of rapid conversion production is that the circuit board can be quickly assembled in various environments. Unwilling to pay the price of delay. The unacceptable test time frame delayed final shipment for two reasons. One reason is the lack of flexible hardware; the second is the test development time spent on a given product.

     Unwilling to bear the cost of fast-turn assembly. EMS with fast-switching services but cannot ship within the OEM time frame must find a solution. Many original equipment manufacturers (OEMs are as aggressive as they are not The price of the circuit board is punished.

       Flying probe testing uses four to eight independently controlled probes to move to the component under test. The test unit (UUT, flying probe tester is a system for testing PCBs in a manufacturing environment. It is not used in the conservative line tester. All the radical needle beds (bed-of-nail interface). The unitundertest is transported to the test through a belt or other UUT conveyor system. Inside the machine. Then fixed, the probe of the tester touches the test pad (testpad and via hole (via) to test the unit under test (UUT single component. The circuit board test probe is connected to the driver through the multiplex system (signal generation) Test the components on the UUT with sensors (digital multimeters, frequency counters, etc.) and sensors (digital multimeters, frequency counters, etc.). When a component is being tested, other components on the UUT are electrically shielded by the probe to prevent reading interference such as extreme Capacitance. With the probe positioning accuracy and repeatability reaching the range of 5-15 microns, the flying probe tester can check short circuits, open circuits and component values. A camera is also used in the flying probe test to assist in finding missing components. Use The camera is used to check the shape of the component with a clear orientation.

     For example, there is a lack of gold prototypes during development (the problem of the "Handardboard" also includes a test development cycle that may be as long as 4-6 weeks; about $10, flying probe testing has solved a large number of existing problems seen in circuit board assembly. 000-$50,000 fixture development costs; Inability to economically test low-volume production; and inability to quickly test prototype prototypes (prototyp assembly. These situations indicate that the conservative needle bed tester lacks low-volume low-cost systems for testing; lacks rapid test coverage for prototype prototype assembly; and cannot Tested to shield the assembly.

       Flying probe testing is an invaluable production resource. In addition, because it has the ability to closely contact and shield the UUT and help to reach the market faster (time-to-market ability. Since there is no need for experienced test and development engineers, the system can be regarded as saving manpower and having added value and time saving, etc. Benefits of equipment.

      For the GenRad GRPILOT system, programming the flying probe tester is easier and faster than the traditional ICT system. E.g. The test developer converts the CAD data of the design circuit board engineer into a usable file. This process takes 1-4 hours. Then the new file runs through the test sequence, generates an .IGE and .SPC file, and puts it in a directory. Then the software runs in the directory and needs to test all the files of the UUT. The short-circuit test type is selected from the option page. The reference point used by the tester on the UUT is selected from the CA D information. The UUT is placed on the platform and fixed. After the software development is complete, the program is "screwed in" to ensure that the best possible test location is selected. At this time, add various components to "maintain" component test isolation) A typical 1000-node UUT test development takes 4-6 hours.

       Start the test and debugging of the typical flying probe test process. Debugging is the next job of the test developer, after software development and loading are completed. Needed to get the best possible UUT test coverage. During commissioning, check each component