Method for testing printed wiring boards for short circuits

摘要

A test pattern preparation unit divides output pins of each circuit element mounted on a printed wiring board into a group to which a logical value 0 is assignable and a group to which a logical value 1 is assignable, to thereby prepare a test pattern for detecting short-circuit failures between the groups. If short-circuit failures are undetectable among output pins in a given group, these output pins are further divided into a group to which the logical value 0 is assignable and a group to which the logical value 1 is assignable. In this way, the output pins are repeatedly divided into groups, to form test patterns for detecting short-circuit failures. These test patterns are applied to the board through a tester to detect short-circuit failures.