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Bright-Source Protection (BSP)

High-Light Cut-Off An electronic function that reduces the voltage to the photocathode when the night vision device is exposed to bright light sources such as room lights or car lights. BSP protects the image tube from damage and enhances its life; however, it also has the effect of lowering resolution when functioning. Boresighting The alignment of a weapon aiming device to the bore of the weapon. See also Zeroing.