Definition of test card in English:

test card

noun

British
  • A still television picture transmitted outside normal programme hours and designed for use in judging the quality and position of the image.

    • ‘As others have pointed out, it's like being whisked back to the 1950s, except that then the only thing on TV at 1.30 pm was the test card, although that was much more riveting viewing.’
    • ‘I still secretly believe that afternoons are the time for the test card and you shouldn't watch television when the sun is out.’
    • ‘Viewers started to get used to the idea that if they switched on their TV screens before 9 am they would have a programme to watch as opposed to a test card or a blank screen.’
    • ‘A full day of test card and music is unimaginable today - but television then was packaged as an evening activity, and daytime broadcasting was almost seen as vulgar and over the top.’
    • ‘Practice varied from company to company - but the ten minutes of blank silence before the ITA test card appeared always gave a dramatic feeling of finality to the transmission.’