Flying needle test machine correction method

Abstract

The present invention provides a flying needle test machine correction method. The flying needle test machine comprises a first test shaft, a second test shaft, a third test shaft and a fourth test shaft. Each test shaft is provided with one probe and one CCD camera corresponding to the probe, and the offset between the point of each probe and the center of each corresponding CCD camera and the total stroke between the probe at the right side and the probe at the inverse side in the X direction are calculated according to the correction method. According to the correction method, the offset between the point of each probe and the center of each corresponding CCD camera and the total stroke between the probe at the right side and the probe at the inverse side in the X direction are calculated are rapidly and accurately obtained. The flying needle test machine correction method employs simple and effective steps and realizes the rapid needle correction of test shafts in the condition of ensuring the correction precision of the needle.

Description

technical field [0001] The invention relates to a needle alignment calibration method for printed circuit board (PCB) testing equipment, in particular to a calibration method for a flying probe testing machine. Background technique [0002] The multi-axis flying probe testing machine is composed of four completely independent moving test needles. Under the control of the software, it moves three-dimensionally on both sides of the PCB board to be tested (2 probes on the front and 2 probes on the back) and touches the point to be tested. The electric test board applies a certain voltage and current to the test needle to obtain different test signals, so as to judge the on-off status of the PCB network to be tested. [0003] The flying probe tester (test probe) requires the test axis to have the characteristics of high speed, high precision and wide test range during the test process. The test accuracy of the flying probe tester mainly depends on the accuracy of the alignment....

AI Technical Summary

Problems solved by technology

[0004] Before the actual test of the flying probe testing machine, the test software first needs to select two alignment points on the front and back, and then the cross target of the CCD camera under each probe needs to be aligned with the center of the alignment point, but the CCD camera and the probe There is a certain position offset. Although there is a default offset between the CCD camera and the probe during mechanical assembly, there is still a certain error between the default offset and the actual offset, and the PCB The test points on the board are relatively small, and the distance between the test points is relatively close. This error is enough to affect the accuracy of the probe needle.

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