The Matter

LENSES: Professional CCTV systems cameras come without lens and only with a threaded connector for the ienstalador assemble the lens that best fits the requirements, which vary from agreement a: object distance.Minimum angle of observation.Varifocal or fixed.Light intensity, variable or fixed.Telephoto fixed or variable. Not all lenses have focus and iris setting. Most must have iris adjustment; some very wide angle lenses have no focus ring. THE MONITOR: The image created by the camera needs to be reproduced in the position of control. A CCTV monitor is virtually the same as a television receiver, except that it has no tuning circuit. But the main feature is the durability of your screen.

We must remember that they require 24 working hours without loss of image quality, for many years in difficult or hostile environments in the CCTV. Figure 2.-CCTV Monitor. SIMPLE system of CCTV: the simplest system is a camera connected to a monitor via a coaxial cable with the supply of electric power to the camera via the monitor. This is known as a camera powered by cable. Diagram 3 shows how a system conforms. The best-known version of this type is the self-contained observation system marketed by supermarkets at a price economic, easy to install. Diagram 3.-connection of a basic CCTV system.

Earlier systems included a single camera, then appeared systems with 2, 3 and 4 cameras which were sequenced automatically by the monitor, because of a built-in sequencer. These systems include lately a quad, which allows to observe the images from 4 cameras simultaneously. Figure 4.-a system of 4 cameras powered by the CCTV system. Professional CCTV systems: Basic installation of CCTV diagram 5 shows how the camera and the monitor are energized through an electrical cord. A coaxial cable carries the video signal from the camera to the monitor. However, we must take into account that the installation must comply with current regulations on the matter.These connections allow great flexibility in the design of complete systems.