ELECTRICAL SCANNING REDUCES BACK-PANEL TESTING TIME.

Industrial continuity testers contain cards that are inserted into the sockets of the panel in place of the logic cards that ordinarily go there. Test cards may or may not themselves contain circuitry; in any case they are connected to a minicomputer or paper tape controller, which is responsible for performing the test. A suggested alternative procedure follows this same approach, but permits the construction of a tester which can check out large backpanels in a small fraction of the time required by present designs. The innovation is in the design of the test cards, which comes from reconsidering the nature of continuity testers.