When thinking about home security, the ideal is to have a system of closed circuit television (CCTV). This is what you should know…
Closed circuit television (CCTV)
This system consists of a camera or surveillance cameras, lenses specially selected to observe particular areas of the home and a video recorder to record what the camera or cameras see.
Mounting a closed circuit TV (CCTV), Step by Step
- Inspect your home. Determine which areas might want to monitor by CCTV. Some external areas of the house could be the garage, the backyard, an adjacent hallway or on the outside of a gate or fence.
- Decide whether you want to put more than one camera inside your home. You could, for example, want to monitor how a nanny cares for your child during the day.
- Decide the size of the scene you want to watch the CCTV system. This will determine the size and type of the camera and lens.
- Decide on the format of the camera. There are five possibilities: 1 inch, 2/3 inch, 1/2 inch, 1/3 inch or 1/4 inch. It is more effective to select 1/2 inch, 1/3 inch or 1/4 inch, for those cameras may use wider range of lenses.
- Determine what type of lenses would like to use. There are four types of lenses for CCTV use: fixed aperture, manual iris, auto iris and zoom. If the area you wish to observe experiences infrequent changes in light, use a manual iris lens that can be adjusted for light only by hand. If the area of CCTV system will be observing experiences frequent changes in light, use a lens with auto iris. These lenses adjust to light changes automatically. Auto iris lenses come in Video or DC, and cameras generally support one format or the other. Make sure your lens matches the camera. For zooming, get a zoom lens. They are available motorized zoom lenses.
- Set the format of the lens based on the format chosen camera (1 inch, 1/2 inch, etc.).
- Investigate how many cameras you need. This will determine whether you will need a switch, a multiplier or multiple monitors.
- Determine the size of the monitor. The larger the monitor, the object appear bigger. Available sizes include 9 inches, 12 inches and 17 inches.
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- Decide whether you need to display more than one scene at a time on a monitor. If so, you need to include a quadruple switch for more than four cameras displayed simultaneously on one screen.
- If you plan to record more than 4-6 hours, you need a commercial recorder. Moreover, you can use a standard VCR.
- Determine whether to record all cameras at once on a full screen if you intend to use a multi-camera CCTV system. If you want to record on one screen all the cameras, you need to include a multiplier.
- Use a measuring wheel to determine the focal length, or the distance from the camera to the subject and the height or width of the subject in the frame.
- Write down all the information gathered by following these steps.
Tips for closed circuit television (CCTV)
- One of the most popular lenses in use today is the Vari-Focal lens that is adjustable.
- Manufacturers or suppliers of measuring lenses have wheels that can have a variable always lost as the other two variables are known. There are also pictures that assist in determining what size lens is required to do a scene a certain size.
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