CS241183B1 - Method of faulty measuring tips localization with printed circuits' boards testers - Google Patents

Abstract

The invention relates to a method of localization faulty adapter tips with needle field for flat plate testers connections. The essence of the method is the division of the measurement field spikes on columns and rows, execution two complete tests for a short circuit when using two special boards printed circuit boards. One special printed circuit board connections connect all measuring tips inside the rows, the second special board flat connections connect all measuring tips inside columns. Tester software allows you to identify a defective one measuring tip in row and column where a fault has been reported by the tester. The method can be used in localization faults on all needle array adapters measuring tips that are used in testers non-mounted and mounted planar boards connections in the production of electronic equipment.

Description

(54) Method of locating defective test tips in printed circuit board testers

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The invention relates to a method for locating defective measuring tips of needle field adapters in circuit board testers.

The principle of the method is to divide the field of the measuring tips into columns and rows, to perform two complete tests for continuity and short circuit using two special printed circuit boards. One special printed circuit board connects all the measuring tips inside the rows, the other special printed circuit board connects all the measuring tips inside the columns. The tester software enables to identify the faulty measuring tip in the row and column where the fault was reported by the tester.

The method can be used to locate faults in all needle tip adapters that are used in both unplated and stepped PCB testers in the manufacture of electronic equipment.

SUMMARY OF THE INVENTION The present invention provides a method for locating defective measuring orifices in printed circuit board testers that use adapters having a needle array of measuring tips.

Recently, methods of testing both unpopulated and populated printed circuit boards have been developed using automatic testers equipped with a needle array of measuring tips, contacting the internal points of the boards. With these testers, it is necessary to be able to accurately locate the faults of all measuring tips for the purpose of self-tester diagnostics. It is necessary to detect both the test leads with a broken connection to the tester and the test leads shorted. In practice, the conductive plate method is commonly used; the procedure is as follows: a plate having all its points connected to each other (a plate of conductive material) is sufficient for the tester needle tips of the tester and a continuity test is performed. If one of the probe tips is not connected or is mechanically damaged and does not contact, the tester will display a fault including location information. However, this method is not applicable to finding a fault location when two measuring tips or connecting paths are short-circuited. A short-circuit test can be performed to detect the short-circuit location with the test tips not connected, but this test takes a very long time, typically tens of minutes.

This disadvantage is overcome by the method of locating defective ones; of the measuring tips according to the invention. : 'y zs \ · ·· - · • Its essence is to divide the field of the measuring tips into columns and rows. A printed circuit board is attached to the PCB, using a special PCB that connects all test points inside the rows during the first test, and a special PCB that connects all test points inside the columns for the second test; Advantageously, a single printed circuit board with a double-sided pattern of uncovered holes can be used, which must be reversed between tests. A faulty measuring tip is found in the row and column where the tester reported an error; all identification can be entrusted to the tester software. The entire test, including the placement of the board, is typically completed in less than 1 minute, since the short circuit test does not have to check all the pairs of special PCBs of the order of thousands, but only the pairs of this special board of tens. .

The advantage of the localization method according to the invention is the considerable time savings in carrying out prophylactic tests of the tester itself and the needle tip adapter of the measuring tips and the resulting increase in labor productivity.

Claims (1)

Subject Method of locating defective test tips in a printed circuit board tester, characterized in that the field of the test tips is divided into columns and rows, wherein a printed circuit board is attached to the printed circuit board, on which all test tips are interconnected during the first test. inside the rows and on which the second test points inside the columns are connected in a second test, identifying the faulty measuring tip as the one in which both the row and the column were found to be affected by the tester.