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step wedge

   Also found in: Dictionary/thesaurus, Medical, Legal, Financial, Wikipedia 0.01 sec.
step wedge [′step ‚wej]
(graphic arts)
A series of tones in steps from white to black usually on film or a glass plate for testing purposes.


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If you are using a Stouffer 21 step wedge to verify the correct exposure time you want to see a clear step I and 2 with a visual step 3.
X-ray machines are also submitted by their manufacturers to be certified as meeting certain standards - most notably the ASTM Step Wedge Test.
A step wedge was sealed inside an envelope and wrapped with either one layer of aluminum foil or metalized Mylar.
 
 
 
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