Minelab F3 Spécifications télécharger pdf (Page 32)

F3 COMPACT Operations Manual

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).

When a target is initially detected, an operator should stand in place

and continue to sweep the F3 COMPACT beyond the target in an

attempt to find clear ground. In doing so the operator will:

a. Immediately gain an impression of the size of the target prior to

commencing the pinpointing procedure; and

b. Confirm the target is not in close proximity to a second target

thereby avoiding a possible booby trap.

NOTE

Minelab recommends a half coil (100 mm/4 inches) overlap on

successive sweeps as an operator moves forward in a mine lane.

4.5 Pinpointing Procedure

The design of the F3 COMPACT makes pinpointing accurate and

fast. The F3 COMPACT’s mono loop coil means there are no gaps

in sensitivity around the coil’s circumference or across its surface.

Pinpointing is conducted by first mapping the target and then finding

its centre.

4.5.1 STEP 1 Mapping the Target

Having detected a target using the sweeping procedure and obtained

a rough idea of its size and location, the precise location of the

target can be ‘mapped’ using the F3 COMPACT’s ‘Edge Detection’

technique.

Edge detection makes use of the coil’s consistent sensitivity around

its circumference to detect the area of a target. To conduct edge

detection, the coil should approach the target location from a variety

of angles as shown in Figure 21.

As the coil approaches the target, the Threshold Tone will change

indicating that coil is in close proximity to the target.

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Minelab F3 Spécifications Page 32

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