Circuit board four-wire test system and test method

Abstract

The invention is applicable to the technical field of circuit board testing, and provides a circuit board four-wire testing system. The system comprises a circuit board and a four-wire testing module;a first through hole is formed in the circuit board, and a first hole ring and a second hole ring are arranged at the two ends of the first through hole respectively; a first test bonding pad and a second test bonding pad are respectively arranged on two sides of the circuit board, the first test bonding pad is conducted with the first hole ring, and the second test bonding pad is conducted withthe second hole ring; the four-wire test module comprises two first test pins and two second test pins, the two first test pins are connected with the first hole ring and the second hole ring respectively and used for testing the voltage of the first through hole, and the two second test pins are connected with the first test bonding pad and the second test bonding pad respectively and used for applying constant current to the first through hole. The circuit board four-wire test system can accurately test the resistance of the through holes in the circuit board. The invention also provides a circuit board four-wire test method.

Description

technical field [0001] The invention relates to the technical field of circuit board testing, in particular to a circuit board four-wire testing system and a testing method. Background technique [0002] In the manufacturing process of the PCB board, it is usually necessary to detect the resistance value of the plating through hole (PTH hole) to check whether the PTH hole has problems such as too thin copper or no copper in the hole. In the prior art, a four-wire test method is usually used for detection, and the four-wire test method needs to arrange test needles around the PTH hole. However, when the width of the annular ring of the PTH hole is too small, for example, the annular ring is less than 0.12 mm, the test needle cannot be set on the annular ring, so that the resistance of the PTH hole cannot be tested by the four-wire test method. Contents of the invention [0003] The present application provides a circuit board four-wire testing system and testing method, wh...

AI Technical Summary

Problems solved by technology

However, when the width of the annular ring of the PTH hole is too small, for example, the annular ring is less than 0.12mm, the test needle cannot be set on the annular ring, resulting in the inability to use the four-wire test method to test the resistance of the PTH hole

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