Registers – Systems controlled by data bearing records – Time analysis
Patent
1977-12-06
1979-12-04
Smith, Jerry
Registers
Systems controlled by data bearing records
Time analysis
2353021, 324 73R, G06F 1104, G01R 1512
Patent
active
041767802
ABSTRACT:
A program is developed for testing printed circuit boards by applying a proposed test program to a board which is initially in an arbitrary response state, comparing the resulting response pattern with a reference, modifying the proposed program if necessary to obtain a valid comparison, running the program on the board successively while faults are applied to selective board input nodes, determining penetration of the faults through the board by analyzing the toggle signatures of the response nodes, and again modifying the program if necessary. Circuit boards are tested with the resulting program by accumulating a running toggle signature number for selected response nodes as the program is applied to the test board, periodically sampling the numbers, and comparing the test samples with corresponding samples from a reference board. Defective board devices can then be traced and remedied; if a sampled defect persists, the test program is advanced in single step increments from the preceding sample until the defect is again detected. The board connections to the defective node may then be analyzed to pinpoint the defect.
The invention also includes apparatus for performing the above method with a programmed data processing means and data storage devices.
REFERENCES:
patent: 3621387 (1971-11-01), Smith et al.
patent: 3924109 (1975-12-01), Jhu et al.
patent: 3924181 (1975-12-01), Alderson
patent: 3961250 (1976-06-01), Snethen
Sacher Eric
Trebelhorn Thomas E.
Cavender J. T.
Dugas Edward
Jewett Stephen F.
NCR Corporation
Smith Jerry
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