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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

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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

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

From BBC ● Nov. 9, 2014

I was a terrible painter – my portraits looked like the evil chimera love-children of Picasso's demoiselles and the BBC test card clown.

From The Guardian ● Apr. 27, 2013

A distance test card consists of letters of various sizes which it has been found can be seen at certain distances by people with good vision.

From Scientific American Supplement, No. 787, January 31, 1891 by Various

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