Test method and device of flying-probe tester

Abstract

The embodiment of the invention discloses a test method and device of a flying-probe tester. The method comprises the steps of conducting a flying-probe test on a sample test board based on the flying-probe tester, and acquiring sample resistance values of each group of test points in the sample test board according to the test result; setting the deviation according to the sample resistance values so as to determine the resistance judgment range of each group of test points; adding the sample resistance values and the resistance judgment ranges to a circuit board data file, and conducting a fly-probe test on a circuit board to be tested according to the circuit board data file; and selecting defects in the circuit board to be tested, and generating a test result report. According to the method, the specific resistance value of each test point of the circuit board can be accurately measured, the test accuracy of the circuit board can be improved, and the defects of the low-resistance circuit can be accurately tested.

Description

technical field [0001] The invention relates to the technical field of printed circuit board testing, in particular to a testing method and device for a flying probe testing machine. Background technique [0002] Flying probe testing machine is an instrument for testing PCB (Printed Circuit Board, printed circuit board) with high component layout density, many layers, high wiring density and small measuring point distance. The multi-axis flying probe testing machine is composed of four completely independent moving test pins. Under the control of the software, it moves three-dimensionally on both sides of the PCB board to be tested (2 test pins on the front side and 2 test pins on the back side) and touches the point to be tested. , By applying a certain voltage and current to the test needle, different test signals are obtained, so as to judge the on-off situation of the PCB to be tested. [0003] With the rapid development of electronic technology, the number of PCB produ...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the open-circuit impedance in the parameter value of the open-short circuit test on the PCB is set to 20Ω. When the circuit resistance is greater than 20Ω, it is judged as an open circuit, and when it is less than 20Ω, it is judged as qualified. For circuits with a resistance value less than 20Ω, it cannot be accurately tested. Out of the actual resistance value, so the line below 20Ω becomes the test blind area

In actual production, it is found that some defects of PCB, such as no copper in the hole, void, thin copper, thin line, line gap, etc., will affect the resistance of the line. When the resistance is less than 20Ω, use the usual open and short circuit test When the method is used to test the above defective boards, the test results show that it is passed, but the actual resistance value changes after high-temperature welding, resulting in an open circuit problem. Therefore, the conventional test method cannot detect the open and short circuit of the high-precision board.

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