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test card

British  

noun

  1. a complex pattern used to test the characteristics of a television transmission system

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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All the instructions are included and they’re also directly on the test card, which is handy.

From Slate • Jan. 27, 2022

He also suggested that some sort of touchable template be placed over a test card or cartridge to orient blind people as to where they should drop liquid or put their nasal swab.

From New York Times • Jan. 10, 2022

If you missed the webcasts, you saw a test card.

From The Guardian • May 2, 2016

Among the lots sold were a vintage microphone and a test card.

From BBC • Nov. 9, 2014

"About twenty letters should be enough for experiment?" he suggested, taking up a test card.

From The Cab of the Sleeping Horse by Scott, John Reed