test card Meaning in the Cambridge English Dictionary
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Meaning of “test card” in the English Dictionary

"test card" in British English

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test cardnoun [C]

uk   us   UK (US test pattern)
a ​picture or ​pattern that was ​broadcast in the past so that the ​quality of the ​televisionpicturereceived could be ​examined and ​improved if ​necessary by using the ​controls on the ​equipment
(Definition of test card from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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