Design for in-circuit testability

The author discusses all of the test requirements and design parameters which must be identified in order to ensure that the proper physical characteristics of a printed circuit board (PCB) design allow for complete test coverage at the in-circuit test level. Several strategies for providing the proper physical layout are presented. Additional strategies for maintaining the usage of existing design fixtures after engineering design changes are also presented. It is noted that the present work serves as a guide toward the development of a complete PCB design for in-circuit testability strategy