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Generator/ Transmitter: Induction; Multiple Services
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 Generator/ Transmitter but NOT directly below
when the Generator/ Transmitter is on its side.
Limitations of Induction Method - There are limitations concerning what can be achieved when using a Generator/
Transmitter 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 may be found that can indicate the
identity of the service.
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 it alone, when other
services are positioned in a close proximity.
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.
0% 30%50%
1m 1m
It is important to check for the presence of adjacent services running
close, or parallel, to the service that you have already located.
1. Check that there are no accessories plugged into the Connection Socket.
2. Turn the Generator/ Transmitter on and check that the batteries are OK.
3. Place the Generator/ Transmitter on the ground ON ONE SIDE over the previously
located service so that you are no longer inducing a signal onto that service.
4. Re-scan the area looking for another peak signal close to where the original
signal was found. This operation should be repeated until you are satisfied that
no further services can be located.
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