Figure 4.5: Inductive Search - SPX Radiodetection RD7000+ Operation Manual

Figure 4.5: Inductive search

The second person holds the locator at the start of the
area to be searched and with the locator antennae at right
angles to the probable direction of the buried lines. Set
the locator sensitivity level as high as possible without the
locator picking up any airborne signals directly from the
transmitter.
When the transmitter and locator are in line both
operators start to move forward in parallel. The operator
with the locator sweeps it backwards and forwards,
keeping the locator vertical, as they proceed in parallel
with the transmitter. This method allows for misalignment
of the transmitter, locator and buried line.
The transmitter applies the strongest signal to the lines
directly below it, which are then located with the locator.
Move the transmitter from side to side to establish the
highest signal which indicates that the transmitter is also
directly above the line(s).
Mark the ground at the point of each peak signal detected
with the locator. Repeat the search along any other
possible paths of lines.
Once the positions of any lines have been marked,
reverse positions, place the transmitter over and along
each line in turn, and trace the line out of the search area.
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