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6.4 Sweeping Procedure.
The F3 should be swept with a smooth even motion at a speed of
0.6 m/s (2 ft/s). If the detector is swept too fast or too slow, small or
deep targets may be missed. The coil should always be kept at the
same height above the ground with care taken to ensure that the coil
is not inadvertently raised at the end of each sweep (Figure 24).
Figure 24: Sweeping Procedure
a. Depth of detection depends on target distance from the coil, not
depth of the target under the ground. Therefore, the coil should
be swept as close to the ground as possible to maximise
detection depth. (Local Standard Operating Procedures take
precedence.)
NOTE
Minelab recommends a half coil (100mm / 4ins) overlap on
successive sweeps as an operator moves forward in a mine lane
b. When a target is initially detected, an operator should stand in
place and continue to sweep the F3 beyond the target in an
attempt to find clear ground. In doing so the operator will:
immediately gain an impression of the size of the target prior to
commencing the pin-pointing procedure; and
confirm the target is not in close proximity to a second target
thereby avoiding a possible booby trap.
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