Using the Signal Generator/ Transmitter:
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/ Transmitter.
1. Stand about 10 m (33’) apart.
2. The first person holds the Signal Generator/ Transmitter, switched
to it’s lowest Output Power Level, close to the ground and ‘end on’
(
see diagram
)
whilst the other holds the Locator switched to
Generator/ Transmitter Mode.
3. Adjust the sensitivity so that the Locator shows a minimal visual
response and emits a minimal audible response.
4. Together, slowly walk across the site, staying the same distance
apart and being careful to keep in line with each other. When the
Signal Generator/ Transmitter gets close to a buried metallic service
the signal will be induced onto it and you should see this in the
increased response on the Locator.
5. Immediately tell your colleague to stop and place the Signal
Generator/ Transmitter on the ground at that point. Now you can
pinpoint the service and trace out it’s route. Continue the sweep
across the length and width of search area.
NOTE
It is important to maintain the same distance and between the Locator and Signal Generator/ Transmitter at all times.
NOTE
Only metallic services that are approximately in line with the Signal Generator/ Transmitter orientation will be energised
with a signal. Metallic services that are crossing the line of the Signal Generator/ Transmitter will NOT be energised.
38
10m (33’)
