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Choosing Systems
There are normally six things to look at before Selecting a CCTV security systems;
- Camera Selection
- Recording Options
- Detection
- Time and Date Stamping
- Cable and Connectors
- Camera Protection
- Camera Selection
Choosing Locations
Is the camera to be located indoors or outdoors? If outdoors then you need to ensure that it is appropriate for the environmental conditions that are likely to be encountered such as rain, snow, sun-glare, low light etc. Outdoor CCTV camera security systems Outdoor cameras should either be classed as weather resistant or mounted in a special enclosure to provide protection.
All CCTV outdoor cameras provided by Voltek are weather resistant and the cable entry points are sealed. The leads are of sufficient length to enable connections to be made inside the building.
Light Levels
Choosing the right camera based on the amount of available light is very important for an effective security system. An ordinary colour or even monochrome camera will not give very good pictures in low light conditions although the monochrome will perform better than an equivalent colour one. Solutions available for low light conditions can include:
- B&W cameras with built in IR illumination
- Colour Day / Night cameras
- Use of additional security lighting
Use of a separate IR illuminator in conjunction with a monochrome camera. When using IR illumination ensure that the range of the illuminators is adequate for your needs.
Light levels are usually measured in lux and although full daylight can be around 10,000 lux, dusk can be as low as 1-10 lux, complete darkness is 0 lux and side street lighting can also be less than 1 lux in some cases. The closer a camera is rated to 0 lux the better its performance in low light levels.
Colour, Black and White or Day Night Cameras
B&W cameras generally provide better image quality than colour ones at lower light levels. They are also usually cheaper than colour ones of equivalent specification. Colour cameras require the availability of good lighting and will generally provide better recognition capability. Day Night cameras provide the best of both worlds in an external environment. They operate as colour cameras during the day (or in good light conditions) and automatically change to B&W when the light levels drop. All Voltek Day Night cameras are supplied with built-in Infra-red illuminators which enable the cameras to see in darkness.
Wired or Wireless
Wireless CCTV cameras are easier to install. There is no cabling to run from the camera to the receiver and they are ideal for temporary applications, rapid deployment or where running cable is not desirable. TheDay Night wireless Security CCTV cameras cameras do however require a power source and whilst most will have the capability to be powered by batteries these do not have a very long life - a matter of hours in some cases. Wherever possible the cameras should be powered by the mains. Typical range for wireless camera systems is 100m free-space but this can reduce significantly to around 20 meters in a typical household environment. In some cases there is also the potential for interference when using wireless systems.
Visible Deterrence or Covert / Discreet Monitoring
For visible deterrence the use of larger cameras housed in traditional enclosures are ideal. For covert or discreet applications Voltek supplies Discreet or Covert CCTV security cameras that are:
- Very small and can be installed in covert locations;
- In enclosures designed to disguise the presence of a camera.
Audio
If the ability to monitor or record sound is important then the camera needs to have a built-in microphone. This enables one-way audio monitoring. Some cameras such as the SuperCam2 from Voltek have a 2-way speech facility that enables you to speak with your visitor without answering the door.
Camera Viewing Quality
The resolution, size and type of camera sensor will influence the quality of the viewable image.
Resolution – This is expressed as the number of television lines (TVL) that the camera is capable of producing. The higher the TVL value the greater the resolution and hence the quality of the images. A typical entry-level camera will be around 300 TVL with higher resolution cameras having a value of 400+ TVL.
Size – A larger image sensor will give a better image definition than a smaller sensor. For example, a 1/3” image sensor will produce a better image than a 1/4 ” sensor.
Type – There are 2 types of image sensor. CMOS sensors are mass-produced and used in entry-level cameras to provide cost savings. CCD sensors are used in professional CCTV cameras and provide a higher quality image.
It is important to remember that the quality of the recorder also influences the quality of the CCTV footage. For example, if you use a high-resolution camera but a low-resolution recorder then the CCTV footage that is captured will still be of low resolution.
Single Camera or Multiple Camera Systems
Do you need to protect and view a single area or multiple areas? If you are likely to require protection of additional areas at a future date then consider buying a system that can be expanded as and when required. Voltek has a range of products that will allow you to connect and use up to 4, 8 or even 16 cameras. These include:
Switchers - These are units that enable a multi-camera system to switch between the various cameras. The switching can be done in a number of ways:
- Manually by the user
- Automatic sequential switching between cameras
- Upon detection of movement by a PIR camera.
Multiple Security CCTV cameras with Switchers The cameras are connected to the switcher and the output from the switcher can be viewed on a TV or it can be connected directly to the recording device such as the VCR or DVD recorder. CCTV switchers can typically allow connection of upto 4 or 8 cameras. The Spectrum control units from Voltek also have additional built-in functionality such as automatic video activation and time and date stamp. It is important to remember however that using a switcher will only allow you to view and record one camera at a time.
Standalone DVRs - Use of digital video recorders allows single or multi-camera systems to be viewed and / or recorded simultaneously.
PC-Based Security Systems - These make use of a PCI card that is fitted inside your computer. They will allow connection of upto 4, 8 or 16 cameras and help turn your existing PC into a sophisticated cctv system.
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