User manual C-SCOPE CABLE AVOIDANCE TOOL

[. . . ] Instruction Manual Cable Avoidance Tool Cable Avoidance Tool XD Signal Generator SG-A Signal Generator SG-V CABLE AVOIDANCE TOOLS WARNINGS The C. Scope Cable Avoidance Tools locate services radiating a detectable field. There may be some services that do not radiate and cannot be located. ALWAYS EXCAVATE WITH CARE Do not use the equipment outside of the temperature range -10°C to +50°C as the batteries may cease to function adequately. Geographical conditions such as hills and mountains can effectively screen radio signals and prevent a detectable ground current. The C. Scope Cable Avoidance Tool alone will not always locate every conductor so always use a Signal Generator. [. . . ] Check that there are no accessories plugged into the connection socket. Turn the Signal generator on and check that the batteries are OK. Place the Signal generator on the ground ON ITS SIDE over the previously located service so that you are no longer inducing a strong signal onto the service. Re-scan the area looking for another peak close to where the original peak was found. This operation should be repeated until you are satisfied that no further services can be located. NOTE This method can also be used to `mask' one service so that another can be found. NOTE The signal will be radiated up to 3 metres either side of the Signal generator but NOT directly below. Limitations of Induction Method - There are limitations concerning what can be achieved when using a Signal Generator on the Induction mode compared to the Connected mode. It is not normally possible to identify what the service is that has been detected with an induced signal. If the signal can be followed far enough, a visible feature such as a valve cover or cable pit cover will be found that can indicate the services identity. Cables with a very small cross section may not have enough signal induced onto them to make them detectable. It is often not possible to apply an induced signal onto just ONE specific buried service, in order to trace that service alone, when that service is positioned close to other services. NOTE An induced signal cannot be applied to a buried service that lies beneath reinforced concrete. The reinforcing bars will re-radiate the induced signal masking any signal that has been induced onto the buried service below. 23 Signal Generator: Using an Inductive Sweep If a large area needs to be searched for buried services then an `Inductive Sweep' could be used. It is an ideal method for detecting the position of buried services as they cross the boundary of a large site. An Inductive Sweep requires two people; one to operate the locator and one to position the Signal Generator. The first person holds the Signal Generator, switched on, close to the ground and `end on' whilst you hold the locator. Adjust the Sensitivity so that the locator is just showing a visual response and emitting an audible response. In unison, slowly walk across the site, staying the same distance apart and being careful to keep in line with each other. When the Signal Generator gets close to a buried metallic service the signal will be induced onto it and you should see this in the increased visual response on the locator. Immediately tell your colleague to stop and place the Signal Generator on the ground at that point. [. . . ] Connection mode is automatically selected when lead is plugged into socket. Induction Mode: Maximum field strength at 10m ­ 40 dB_µA/m Maximum power output into a single turn close coupled - 465 mW (0. 22 load, 0. 32V rms). Construction: Injection moulded high impact plastic case sealed to IP65. Incorporates a clip-on accessory compartment. [. . . ]