Electrical Contracting News (ECN) March 2017 - Page 34

SPECIAL FEATURE SECURITY CAUGHT ON CAMERA The smaller the lens size, the broader the image that can be achieved. Matt Parton, product development manager at ESP, provides the answers to some of the most frequently asked questions on the subject of CCTV. What does a CCTV system comprise of? There are four main components: • Digital video recorder (DVR) – the brains and storage device of the system • Camera – the eyes of the system • Cable – to connect the cameras to the DVR • Monitor – to connect to the DVR for initial set-up and accessing the menu/ playback functions What type of system should I go for? This will depend on what the end user and operator of the system expects and will require a thorough examination of the requirements. The installer can then assess the coverage and the image detail that is required. A system can be built by selecting the individual components or purchasing a CCTV kit that contains everything required. What should I look for in a DVR? The record resolution of the DVR is very important; this will dictate the quality of the footage. For high definition quality, 720p and upwards is recommended. Hard drive capacity; this will identify how much footage can be stored. Functions such as the schedule record and motion detection record facilities are not only beneficial for utilising storage space on the hard drive, but also useful when the time comes to play back an incident that has been captured. How long will a DVR record for? There are a few variables to consider – the hard drive capacity; how many cameras are on a system; whether the system is set to record continuously 24/7, or is on motion detection record. As a general guide 1Tb (Terra Bite) should be plenty to cover a four channel system with 720p capability on motion record. The idea is to cover the length of time the property will potentially be vacant (eg. a two-week holiday). Are DVRs simple to use? Most systems now are mouse/remote controlled and have user friendly menus to assist the user. 34 | March 2017