test card

See also: testcard

English

Noun

test card (plural test cards)

  1. (optometry) A card printed with various letters or symbols, used in testing vision.
    Synonym: Snellen chart
  2. (UK, television) A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).
    Synonym: test pattern
    • 2013, Chris McManus, Right Hand, Left Hand‎[1], Hachette, →ISBN:
      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.

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