CM-4221 Installation Manual124 WDR Function Noise Reduction TV System6.5.1 Exposure SettingThe Exposure pull-down menu is shown as follows:The exposure is the amount of light received by the image sensor and is determined by thewidth of the lens diaphragm opening, the amount of exposure by the sensor (shutter speed),and other exposure parameters. With this setting, users can define how the Auto Exposurefunction works.There are two exposure modes: Auto Mode and Manual Mode.Auto ModeWithin Auto Modes, there are three settings: Auto Iris Min Shutter SpeedWhen selecting this mode, the shutter is completely open and exposure priority isgiven to the auto iris. Shutter speed and AGC circuit function automatically incooperating with the iris to get consistent exposure output.o In PAL systems, the minimum shutter speed is selectable in steps of1/25/, 1/12, 1/6, 1/3, and 1/1.5 seconds.o In NTSC systems, the minimum shutter speed is selectable in stepsof 1/30, 1/15, 1/8, ¼, ½, and one second.
