Meaning of test card | Babel Free

Definitions

1. A card printed with various letters or symbols, used in testing vision.
2. A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).
   UK

Equivalents

Examples

“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.”

CEFR level