i-on50EX/EXDPage 32. Before You BeginPreparationBefore installation you should carry out a surveyof the site. You need to know how many and whatkind of detectors will be monitored by the controlunit. You also need to assess where any radioexpanders must be placed in order to receiveradio signals from their detectors successfully.Radio Site SurveyIf you intend to fit radio expanders you shouldconduct signal strength tests. Eaton’s SecurityBusiness produces the Scantronic 790r hand heldsignal strength meter and 734r-01 test transmitterfor this purpose. Please read the 790r manual fordetails.Please be aware of the following: The 790r signal strength meter readingsshould be used only as an guide when initiallychecking the site. A reading of four green LEDs or higherindicates an acceptable signal strength. Once you have installed the alarm system youshould put the control unit into the Installertest menu and test the received signalstrength from each radio transmitter. A signal strength reading of two or more unitsby the control unit from each transmittershould provide reliable operation in theinstalled system. (Note: if you take the signalstrength using Eaton’s Security BusinessDownloader or the web browser interfacewhile the panel is in user mode then theminimum acceptable signal strength is fourunits. Ensure that the control unit is in Installermode when reading signal strengthsremotely.) When you record the signal strength readingsfor later inspection, you should record thereadings taken from the control unit of theinstalled system while it is in the InstallerMenu.Please be aware that the signal strength receivedfrom a transmitter can change after installationbecause of local environmental changes. Forexample, users switching on laptops nearby, ormoving metal cabinets from their original positioncan all affect the signal from a transmitter. Pleaseread Eaton’s Security Business publication”Guidance Notes for Wireless Alarm SystemInstallations” obtainable fromwww.coopersecurity.co.uk for more informationabout the factors affecting radio signal strength.Siting the Control Unit and Wired ZoneExpandersWARNING Ensure that the fixings are strongenough to support the weight of the control unit,its lid and a 17Ah lead acid battery. The totalweight of the control unit plus batteries can be upto 12kg.Do site the unit:Upright, battery at the bottom. (This does notapply to the wired zone expander.)Within a protected zone.Do NOT site the unit:In the entry or exit zones, or outside the areacovered by the alarm system.Next to electronic equipment, particularlycomputers, photocopiers or other radioequipment, CAT 5 data lines or industrialmains equipment.Siting KeypadsDo site the keypad:Within the area protected by the alarmsystem.At a convenient height and location for theuser.Out of sight of potential intruders.Do NOT site the keypad:Next to electronic equipment, particularlycomputers, photocopiers or other radioequipment, CAT 5 data lines or industrialmains equipment.Where the cable run will exceed the capacityof the bus, see page 12.If fitting two or more keypads with internal proxreaders make sure that you place the keypadsmore than one metre apart from each other, orfrom any other type of prox reader. (At less thanone meter separation the proximity tag readerswill interfere with each other.) Remember not toplace keypads or external prox readers onopposite sides of the same wall.If you intend to fit external prox reader KEY-EP toa KEY-KPZ01/KP01, then do not site the externalprox reader itself closer than one meter to anyother keypad or other type of prox reader.Siting Wireless Zone ExpandersDo site the unit:Upright.Within a protected zone.As high as possible. However, do make surethat the unit is on a similar level to thetransmitters or receivers.More than 10m from another radio expander.