Minelab F3 Manuale di Servizio Scaricare il pdf (Pagina 37)

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).

P0624-A

Mine Lane

Direction of

Movement

P0655-A

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

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Minelab F3 Manuale di Servizio Pagina 37