For LEVEL CONTROL we have terms and definitions in 2 topics. The topics are CCTV and Video Surveillance.

Used to set the auto-iris circuit to a video level desired by the user. Turning the level potentiometer towards the HIGH position will open the iris allowing more light to pass through the lens, towards the LOW will close the iris allowing less light to pass through the lens.
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Level control is control of the main iris, and sets the auto-iris circuit to a specific video level of the users choice. The iris is therefore set to maintain this video level no matter what the light condition may be. A high level opens the iris; a low level closes it.
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