apictureorpatternthat wasbroadcastin the past so that thequalityof thetelevisionpicturereceivedcould beexaminedandimprovedifnecessaryby using thecontrolson theequipment
Television could use the time when thetestcardis on the screen to put out programmes of direct help and benefit to old people.
From the
Hansard archive
Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0
Thetestcardwas a vital tool in its day, but has become far less important.
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Programming started on the hour, with visitors who did not get to the site on time faced with atestcardand 1970s-style intermission music.
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The hours of broadcast were limited and so, for test purposes, atestcardwas commonly broadcast at other times.
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The station is currently on the air with atestcardwithout audio sound being played to fulfill the requirements from time to time.
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A standard bluewool textile fadingtestcardis also placed in the same light conditions as the sample under test.
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He was simply to follow the instructions on thetestcardand fly the airplane appropriately.
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As television is usually broadcast 24 hours a day, thetestcardis now rarely used.
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Visitors late for broadcasts were shown atestcardwith 1970s-style intermission music.
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Wikipedia
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Both sides of thetestcardcan be peeled open, to access the inner guaiac paper.
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The sum of the threetestcardtime scores constitutes the summary score for the entire test.
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Then the cameras were adjusted to appear identical on picture monitors, by alternately switching between and comparing the monoscope image and thetestcardimage.
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In video production, this tone is usually accompanied by atestcardso the video signal may be calibrated as well.
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Wikipedia
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In theory, an incident-light measurement should agree with a reflected-light measurement of atestcard of suitable reflectance that is perpendicular to the direction to the meter.
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Wikipedia
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For example, test cards should be matched to the key card with the same colour.
From theCambridge English Corpus
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