Flying needle test

The flying needle tester is an improvement on the traditional on-line tester of needle bed. The needle bed can be replaced by probes. The X-Y mechanism is equipped with four ***8 test probes, which can move at high speed respectively, and the minimum test gap is 0.2 mm When working, the unit under test (UUT) is transported to the testing machine through a belt or other UUT conveying system, and then the probes of the testing machine are fixed to contact the test pads and vias, so as to test a single element of the unit under test (UUT). The test probe is connected to the driver (signal generator, power supply, etc.). ) and sensors (digital multimeter, frequency meter, etc. ) Test the components on UUT through multiplexing system. When one component is tested, other components on the UUT are electrically shielded by the probe to prevent reading interference.

Flying needle tester can check short circuit, open circuit and component value. A camera is also used in the flying needle test to help find the missing components. Use a camera to check the shape of components with clear direction, such as polar capacitance. The positioning accuracy and repeatability of the probe reach the range of 5- 15 micron, and the flying needle tester can accurately detect UUT.

Flying needle test has solved many problems in PCB assembly: for example, the test development cycle may be as long as 4-6 weeks; The development cost of fixture is about10000-50000; It is impossible to economically test small batch production; And that prototype assembly cannot be teste quickly.

Flying needle testing is a valuable production resource, because it can closely contact shielding UUT and bring new products to market faster. In addition, because there is no need for experienced test and development engineers, the system also has the advantage of saving manpower and time.