F3 Operations Manual
38
b. STEP 2 Determining the Centre
The pitch of the Threshold Tone will rise or fall depending on the
combination of metals or the composition of metal in a mine.
This means that, in some instances, experienced operators may
be able to identify one mine against another.
By slowly moving the coil across the mapped area, it may be
possible to detect tonal differences indicating multiple targets.
Figure 26: Multiple Targets
4.7 Changing Batteries. The F3 operates using 4 D cell
alkaline or rechargeable batteries. Circuitry within the F3
continuously monitors the voltage levels of the batteries to ensure
that sensitivity of the F3 remains at the correct level.
The volume from a large target may mask that of a
small target if the small target is located very close to
the large target.
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