test card

See also: testcard

English

Test card (optometry)

Test card (television)

test card (plural test cards)

(optometry) A card printed with various letters or symbols, used in testing vision.
Synonym: Snellen chart
(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, 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.

vision test card

broadcast test signal

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