Minelab F3 Manuel de service télécharger pdf (Page 23)

F3 INSTRUCTOR NOTES

Minelab Countermine Division Safety Through Excellence

Nineteen

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



P0624-A



Mine Lane

Direction of

Movement

P0655-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 maximize 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.

• When a target is initially detected, an operator should continue to sweep the

F3 beyond the suspected target in an attempt to find clear ground. In doing

so the operator will:

o immediately gain an impression of the size of the target prior to

commencing the pin-pointing procedure; and

o confirm the target is not in close proximity to a second target

thereby avoiding a possible booby trap.

Twenty

Pin-Pointing Procedure

• The design of the F3 makes pinpointing accurate and fast. The F3’s

monoloop coil means there are no gaps in sensitivity around the coil’s

circumference or across its surface. Pin-Pointing is conducted as follows:

o STEP 1 Mapping the Target

Having detected a target and obtained a rough idea as to its size and

location using the sweeping procedure, the precise location of the

target can be “mapped” using the F3’s “Edge Detection” technique.

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Minelab F3 Manuel de service Page 23