Installation manual

CM-4221 Installation Manual
124
 WDR Function
 Noise Reduction
 TV System
6.5.1 Exposure Setting
The Exposure pull-down menu is shown as follows:
The exposure is the amount of light received by the image sensor and is determined by the
width 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 Exposure
function works.
There are two exposure modes: Auto Mode and Manual Mode.
Auto Mode
Within Auto Modes, there are three settings:
 Auto Iris Min Shutter Speed
When selecting this mode, the shutter is completely open and exposure priority is
given to the auto iris. Shutter speed and AGC circuit function automatically in
cooperating with the iris to get consistent exposure output.
o In PAL systems, the minimum shutter speed is selectable in steps of
1/25/, 1/12, 1/6, 1/3, and 1/1.5 seconds.
o In NTSC systems, the minimum shutter speed is selectable in steps
of 1/30, 1/15, 1/8, ¼, ½, and one second.