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test card

noun — 2 senses

test card

noun
1

A card printed with various letters or symbols, used in testing vision.

2

Broadcasting, Media, Television UK A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).

  • In 1967, the BBC needed a ‘test card’ for its new colour broadcasts, to be put on the screen when programmes were not being transmitted so engineers could adjust the quality of the picture.2013, Chris McManus, Right Hand, Left Hand, Hachette, →ISBN:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.