Sweeping Procedure - Minelab F3 Operation Manual

5.4 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).
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.)
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
P0624-A
Figure 24: Sweeping Procedure
NOTE
Direction of
Movement
Mine Lane
36
P0655-A