Combined AOI/boundary scan ensures maximum test coverage

AUGUST 1--The combination of automated-optical-inspection (AOL) and boundary-scan test technologies, originally conceived by GOEPEL electronic GmbH (Jena/Germany; www.goepel.com), has been enhanced for use in an in-line production environment.

AUGUST 1--The combination of automated-optical-inspection (AOL) and boundary-scan test technologies, originally conceived by GOEPEL electronic GmbH (Jena/Germany; www.goepel.com), has been enhanced for use in an in-line production environment. The amalgamation of two key test technologies in a single system allows the detection of faults that cannot be identified by AOI alone. In particular, the system is capable of testing hidden solder joints on highly complex components such as BGAs.

The combined system consists of GOEPEL electronic boundary scan software and hardware integrated into its OptiCon AdvancedLine and SpeedLine in-line AOI systems. A universal contactor connects power supplies and the JTAG bus to the unit under test (UUT) in an in-line process. Test coverage is extended by a special test probe mounted on the camera for checking boundary-scan IC pins that do not have any connections to other boundary scan pins (for example, BGA pins that are wired directly to a connector). A fully programmable power supply monitors the UUT's power consumption during testing. It can detect any shorts in the UUT's power supply circuitry, thereby avoiding damage to the UUT or invalid test results.

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