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      <page pageid="524" ns="0" title="Recent Updates">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">'''29th August 2015'''&lt;br&gt;
Added [[CCTV and London Riots]] article.

'''25th May 2013'''&lt;br&gt;
Added [[CCTV Maintenance Contracts]] section.

'''12th January 2013'''&lt;br&gt;
Added [[Rapid Deployment CCTV]] article.

'''4th January 2013'''&lt;br&gt;
Added [[Take Care When You Tender]] and [[IP Cameras and Low Light]] articles.

'''8th November 2012'''&lt;br&gt;
Added [[Wide Area High Resolution Surveillance]] article.

'''18th May 2012'''&lt;br&gt;
Added [[Privacy, DPA and PATS]] article.

'''7th February 2012'''&lt;br&gt;
Added [[Three-dimensional (3D) design in CCTV &amp; Security]] and [[CCTV Statistics]] articles.

'''3rd August 2011'''&lt;br&gt;
Added [[White Paper: Mobile Wireless CCTV]] and [[Wireless CCTV by Metronet]] articles.

'''29th June 2011'''&lt;br&gt;
Added [[3 CCTV Quotes – Buyer Beware]] and [[3 Quotes - How We Can Help You]] articles.

'''12th February 2011'''&lt;br&gt;
Added [[Video Analytics Unit]] product information.&lt;br&gt;
Added [[How to Install Your Own CCTV System]] article.

'''27th January 2011'''&lt;br&gt;
Added [[5 Fatal Mistakes When Buying CCTV]] article.

'''23rd January 2011'''&lt;br&gt;
Added [[White Light Savings]] article.

'''21st October 2010'''&lt;br&gt;
Updated various sample chapters in [[The Principles &amp; Practice of CCTV]] book section.

'''3rd September 2010'''&lt;br&gt;
Added [[Infra Red and LED Lighting]] article.

'''13th August 2010'''&lt;br&gt;
Added [[Video Analytics for Security Applications]] article.

'''10th August 2010'''&lt;br&gt;
Added [[Why LED lighting is the best technology to use with CCTV]] article.&lt;br&gt;
Added [[Why are CCTV pictures so poor?]] article.&lt;br&gt;
Added [[Video Analysis]] article.&lt;br&gt;
Added [[The Best is Useless]] article.

'''24th June 2010'''&lt;br&gt;
Replaced 'Buying CCTV' section with expanded [[Purchasing CCTV]] section.

'''25th April 2010'''&lt;br&gt;
Added [[CCTV Advertising - Buyer Beware]] article and details of the [[Data Protection Awareness Training Course]].

'''21st January 2010'''&lt;br&gt;
Updated [[Tavcom Electronic Security and CCTV Training]] schedules.

'''15th December 2009'''&lt;br&gt;
Added [[A Guide to Complying with Current Legislation]] article.

'''6th May 2009'''&lt;br&gt;
Added [[Police Response to Remotely Monitored CCTV]] knowledge article.

'''26th March 2009'''&lt;br&gt;
Added [[Getting Police to Use CCTV]] knowledge article.

'''1st November 2008'''&lt;br&gt;
Added [[PIR Detectors for CCTV|Luminite]] wireless PIR detector product and [[Understanding Passive Infra Red (PIR) Movement Sensors|additional useful information]].

'''11th October 2008'''&lt;br&gt;
Added ecovision wind and solar powered &quot;green&quot; CCTV product information.

'''29th July 2008'''&lt;br&gt;
Updated Pan tilt and zoom domes product information.&lt;br&gt;
Added IP CCTV product and additional information.

'''5th July 2008'''&lt;br&gt;
Added TSS Mobile CCTV Systems product information.&lt;br&gt;
Re-instated LensCalc online lens calculator.

'''2nd July 2008'''&lt;br&gt;
Added Viseum product information for intelligent moving cameras. (removed 08/06/2011)

'''23rd June 2008'''&lt;br&gt;
Added SentryScope product information for wide area facial recognition.

'''21st June 2008'''&lt;br&gt;
Added SmartTrack product information with Warehouse CCTV case study.

'''29th April 2008'''&lt;br&gt;
Updated Tavcom training section with new course dates.&lt;br&gt;
Added Light &amp; CCTV article.&lt;br&gt;
Added The Way to Build a Contract article.&lt;br&gt;
Added Watch for Monitoring Fine Print article.&lt;br&gt;
Added National CCTV Database news article.

'''13th April 2008'''&lt;br&gt;
Added CCTV User Guide for Shopping Environments article.

'''4th April 2008'''&lt;br&gt;
Updated Data Protection Act section in view of new policy documentation from the ICO.

'''10th January 2008'''&lt;br&gt;
Added News Items section (see left hand navigation).

'''12th December 2007'''&lt;br&gt;
Updated Data Protection Act section with new products.

'''27th October 2007'''&lt;br&gt;
Added CCTV Internet Video Servers and updated SafeGuard Security Consultants section.

'''8th June 2006'''&lt;br&gt;
Added Farsight Remote CCTV Monitoring and Twisted Pair Transmission sections.

'''27th March 2006'''&lt;br&gt;
Modified Data Protection Act section.

'''24th January 2006'''&lt;br&gt;
Added Digital Imaging Procedures article.

'''26th November 2005'''&lt;br&gt;
Added CCTV using Twisted Pair article.

'''19th November 2005'''&lt;br&gt;
Added Armoured Functional Camera (aka Metal Mickey) article.

'''24th October 2005'''&lt;br&gt;
Added CCTV Surveillance Vehicle Equipment and Useful Information sections.

'''20th April 2005'''&lt;br&gt;
Added Groundwork section.

'''25th October 2004'''&lt;br&gt;
Updated The Data Protection Act section.

'''4th October 2004'''&lt;br&gt;
Added Resolving the Problem of Focus Shift article.&lt;br&gt;
Added CCTV Control Room Console Furniture section from Knotty Ash Woodworking.

'''11th July 2004'''&lt;br&gt;
Added Installation Companies, Consultation Service and Obtaining Competing Quotations sections.

'''4th April 2004'''&lt;br&gt;
Added CCTV Leasing section.

'''14th February 2004'''&lt;br&gt;
Added Till/ATM Fraud section.&lt;br&gt;
Added Domes and Infra Red article to the Useful Information section.

'''9th November 2003'''&lt;br&gt;
Replaced Automatic Number Plate Recognition article in the Useful Information section.

'''8th November 2003'''&lt;br&gt;
Added Equipment Overview article to the Useful Information section.</rev>
        </revisions>
      </page>
      <page pageid="672" ns="0" title="Remote Positioning Devices">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">__NOTOC__
== Introduction ==

There are two main types of remote positioning device, those that move only in a horizontal plane, and those that can move in two planes. Movement in a horizontal plane is known as panning or scanning. Movement in the vertical plane is known as tilting. The device that provides movement in both planes is called a pan, tilt unit or pan, tilt drive. 

Both scanners and pan, tilt units are made for indoor and outdoor use. The construction is fundamentally the same except that those units for external use are designed for the appropriate IP rating. (See Chapter 9 for description of IP ratings). Pan, tilt units are also produced for the range of hazardous environments mentioned in Chapter 10.

== Scanners ==
A common type of scanner is shown in Diagram 11.1, which may be designed for either internal or external applications.

[[file:diagram11.1.png]]
&lt;br&gt;Diagram 11. 1 Typical Scanner Unit

The camera may be mounted directly on the platform in usual indoor situations. The camera mounting platform is adjustable to a fixed position of tilt by a bolt through the pivot. The degree of rotation is set by two movable strikers that operate limit switches at each end of the required travel. These units can be set to automatically reverse when a limit switch is operated and therefore continuously scan between the set limits. This is called auto-pan and requires an additional simple board in the control unit. The wiring is very simple and telemetry would not generally be used for controlling this type of device.

For external use the units are larger and made weatherproof to the appropriate standard. They are also more powerful than indoor models because they need to support a weatherproof housing. The camera supply and coaxial cables must be left with sufficient slack to eliminate strain through the movement of the scanner. There should be enough slack cable to allow for the maximum travel of the unit. Although it may be initially installed with a small degree of scanning, requirements could change in the future.

Typical scanning speed is 6° per second and maximum rotation in the order of 345°. There is usually a minimum rotation of 5°-10° due to the size of the limit stops.

This type of scanner is not very attractive in appearance especially with the slack cables going to the camera. On the other hand it is easily seen and is often used for its deterrent value. Where aesthetics are important or discrete mounting is needed there are other types of scanners available. The hemispheres and domes mentioned in Chapter10 could incorporate scanning drives.

[[file:diagram11.2.png]]
&lt;br&gt;Diagram 11. 2 Housings for Discreet Scanners

== Pan, Tilt Units ==
As with scanners, pan, tilt units may be designed for either internal or external use. There are two main types of pan, tilt unit. The first is a unit where the camera or housing is mounted directly on a platform that forms part of the construction. There are two types of this design where the platform is either mounted on the side of the unit or over the top. The second type of pan, tilt unit is where the driving components are contained within an enclosed housing.

[[file:diagram11.3.png|350px]]
&lt;br&gt;Diagram 11. 3 Types of Pan, Tilt Unit

== Rating of Pan, Tilt Units ==
Pan, tilt units are rated by the load carrying capacity of the platform. In addition, over the top units are rated by the centre of gravity of the load being within a certain distance above the top of the platform. See comments later for load rating of over the top units.

&lt;small&gt;This article is an extract from chapter 11 of '[[The Principles &amp; Practice of CCTV]]' which is recognised as the benchmark for CCTV installation in the UK.&lt;/small&gt;</rev>
        </revisions>
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