Test pattern definitions

Test pattern

1) Arrangement of exams 2) Early TV transmission 3) Old late-night broadcast 4) Sign-off transmission 5) Video signal calibration tool
Found on https://www.crosswordclues.com/clue/test-pattern

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test pattern

During testing of a PCA, patterns of signal faults are inserted into the circuitry, and its response is observed to determine if the faults were recognized appropriately. See circuit fault.
Found on http://www.encyclo.co.uk/local/20870

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