Sweeping Procedure - Minelab F3 Operation Manual

F3 Operations Manual
4.4 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 22).
a. Depth of detection relies 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.)
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 suspected 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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Figure 22: Sweeping Procedure
NOTE
Direction of
Movement
Mine Lane
32
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