Abstract: A method for adjusting an object detection apparatus is disclosed and which includes the steps of providing an image intensifier tube having an electroluminescent screen, and which produces a screen current output when the image intensifier tube processes electromagnetic radiation; measuring the screen current output produced by the electroluminescent screen; providing an emitter of electromagnetic radiation which is electrically coupled with a source of electricity, and which, when periodically energized, produces an electromagnetic radiation output; and adjusting the period of time which the emitter of electromagnetic radiation is energized based upon the screen current output which is measured at the electroluminescent screen.