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CCTV access control and perimeter security 4 tips for building a CCTV in the store

Install DIY CCTV

The role of video surveillance and more enhances its importance in our life. A recently about expensive and unreachable pleasure to watch your home, Office or store, enters an increasingly mass in ordinary life.

Declining prices of components for CCTV, possible easy installation by non-experts, lead us to the thought to make more accessible using this technique in our lives, as we show you how to mount alone CCTV system. Monitoring of space war in the night, of the employees in the Office and the store of people who’re trying to harm us, undisputed causes the effect of greater certainty, efficiency of work and more calm in the tense days.

Here we will try with a few lessons to offer our customers how to build CCTV system, save valuable resources for installation, because anyone could execute a CCTV system at home, at the store, in the Office. And the bottom line is that you need to have a little knowledge about electrical engineering and handling of hand-held power tools.

Install DIY CCTV

The components of video surveillance

A CCTV system consists of the following main components:

CCTV cameras;

recorder;

power supply;

wires and connectors;

For the video cameras:

Currently, there is a wide variety of CCTV cameras. Most of them are manufactured in the far East – China, Taiwan, Korea. The market is offering and camcorders of world-famous brands – manufactured in Europe or the United States. The last step in the value class of East Asian manufacturers, and frankly speaking, for a small system, it is not necessary to spend money on such equipment.

Parameters and selection of camcorder:

Camcorders are characterized by several parameters: resolution, focal length, distance to night lighting and more. The main parameter for selection of camcorder is resolution. The latter generally is measured in TV lines (TVL) and represents a parameter defining the camera’s ability to distinguish small details of the picture. Most cameras are available on the market with 420 TVL, the quality image that defines the hard recognition of small details from the object (or put another way hard recognize faces of people). From mass-used, there are cameras with resolution of 540, 600, 650 and 700 TVL. The latter offer a picture that approaches the maximum to the television camera.

The focal length determines the parameters of the lens in front of the matrix of the camcorder. It depends what area can be monitored by the camera itself, as there is a close relationship between focal length, the depth of the painting and the surveillance area. The focal distances as numbers are 2.8, 3.6 to 16 mm and more, such as those with a larger value will monitor closely the object, but a small part of it. Or a camera with a focal length will monitor the larger area, but with smaller details. For surveillance of shops and offices are most commonly used cameras with focal length of 3.6 and 6 mm.

Infrared illumination characterized the ability of the camera to illuminate the object at night or in reduced light at length, i.e., cameras with more LEDs (the Illuminators of the infrared light, embedded in the camera itself) will illuminate at a remote location object from those with less or more small-scale luminaires. There is a need to insert that there are video cameras and no backlight, but they seem to be shifting of these night vision, since they are more universal. The parameter for night lighting is mentioned by the manufacturer . These are general parameters, with which you should consider when selecting a camcorder. In our guidance, we will offer you the options, we will show you examples and guidance in choosing will prove to be an easy task.

Recording devices

The principle of recording of information taken from video cameras is the following: conversion of analogue signal from the camera in digital form, in his famous compression formats and recording on magnetic media is most commonly a hard disk or Flash memory. Recording devices available on the market are video recorders (DVR) and capture (DVR boards) that are mounted in a personal computer. Video in themselves constitute computer that has the task of converting the signals from the cameras, compression, recording on the hard magnitel media (hard drive) and the connection to the local network or the Internet.

Video also have parameters that characterize their application. Some of them are: number of channels (number of cameras that can be inserted to them), the dynamism of the painting (frames per second – fps), the ability to support a particular format HDDs on a cyclic basis, compression (avi or h264) etc. The most commonly proposed on the market video recorders are 4, 8 or 16 input. Support HDDs on a cyclic basis from 500 GB up to 2 TB. Built with video recorder system has the following advantages: better quality of recording, of observation through the Internet, small size, management by remote control or a mouse, low consumption, etc. For building small and medium sized CCTV systems it is the best option, offering the simplicity of the interface, flexibility and independence.

Capture boards for CCTV, represent a compromise of video and be mounted in places where it is not necessary high quality, available PC, permanently connected to the network and Windows operating system. Generally, they offer a lower dynamism of the picture smaller opportunities and use the computer’s hard drive, in which they are embedded. Limitation is the type of chipset on the motherboard of the computer that is necessary is to Intel when using boards Geovision. Their low cost makes them favorites for home monitor system, for small shops and offices.

It should be mentioned that with suitable microphones and two types of recording devices can record sound, such as the number of channels depends on the type of device.

Power supply units

Often overlooked as part of a CCTV system, power blocks define the quality and efficiency of the system. Parameters of power blocks are voltage (constant or variable), maximum current, filtration of interference, operating temperature. Can confuse even the specialist and tempted by the lower price to confuse to choose inadequate power supply. as manufacturers of power supplies give parameters in ideal conditions it is necessary the current hoarding power. For more secure work experience shows that hoarding of 30% required up to 70%.

The most common power supply is 12VDC (upright and filtered) and 24VAC (variable power supply directly from the viral load, transformer). On the data plate of each camera is shown the type of power supply and consumption. It’s enough to make a choice of the power module.

Wires and connectors

CCTV cameras transmit complex analogue signal which can directly connect to the inputs on the TV, the so-called. chinch or SCART. The signal is a relatively low-frequency, as the standard for the output terminals is a BNC connector and used TV cables-coax. In a standard coaxial cable the signal can be transmitted without additional reinforcement to around 70-100 m there are numerous varieties of connectors for mounting.

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