Distinguishing method for test fixture steel needles

Abstract

The invention discloses a distinguishing method for test fixture steel needles. The distinguishing method comprises a first step of determining color categories and extending lengths of coated / plated coloring layers of the test fixture steel needles of different models and a second step of coating / plating the coloring layers on partial circumferences of the outer surfaces of the test fixture steel needles of different models according to the determined coloring layer colors and extending lengths corresponding to the test fixture steel needles of different models; and enabling the coloring layer colors and the extending lengths of the outer surfaces of the test fixture steel needles of different models to be different. The distinguishing method has the advantage that the coloring layers with different colors and different extending lengths on the outer surfaces of the test fixture steel needles are utilized to distinguish the test fixture steel needles of different models. The distinguishing method is simple, convenient and efficient. The problems of inconvenience in needle replacing, high cost, errors in needle replacing and the like caused by two traditional modes are solved, the test steel needles with the diameters close to each other can be distinguished extremely rapidly and accurately, and testing working efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of PCB board testing, in particular to a method for distinguishing test fixture steel needles. 【Background technique】 [0002] As the density of circuit boards is getting higher and higher, ordinary test fixtures can no longer meet the needs, and it is necessary to use large-slope test fixtures for testing. However, a large slope requires the use of an extended steel needle. In the past, two main methods were used to distinguish different types of steel needles: one is the test steel needle with colloidal particles used by LM in Germany. The defects of this test steel needle are as follows: Since the test steel needle has colloidal particles, it is necessary to take out the jig and change the needle from the other side during the test process. The process is cumbersome and affects the test efficiency. In addition, it increases its cost; and the other is Using the current customary straight needles has the...

AI Technical Summary

Problems solved by technology

[0002] As the density of circuit boards is getting higher and higher, ordinary test fixtures can no longer meet the needs, and it is necessary to use test fixtures with large slopes for testing

However, a large slope requires the use of an extended steel needle. In the past, two main methods were used to distinguish different types of steel needles: one is the test steel needle with colloidal particles used by LM in Germany. The defects of this test steel needle are as follows: Since the test steel needle has colloidal particles, it is necessary to take out the jig and change the needle from the other side during the test process. The process is cumbersome and affects the test efficiency. In addition, it increases its cost; the other is Using the current customary straight needles has the following problems. The diameter and length of the steel needles are similar and it is difficult to distinguish them. It is easy to make mistakes when replacing the steel needles, resulting in unstable or impossible tests.

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