REACTIVITY
14
Example
Passing the coil over an iron object close to
the surface then over a noble metal target
(ring).
0
1
2
3
4
5
With a low Reactivity level, the iron is detected
for a longer duration, to the extent that it
completely hides the ring.
A high Reactivity level enables you to
distinguish the ring completely from the iron.
The audio signal fully indicates the target.
Full sound
Short sound
No sound
With a medium Reactivity level, you begin
detecting the ring.
The audio signal partially indicates the target.
In terms of pure performance, the greatest detection ranges are obtained with low reactivity
levels. However, you will nd more targets on dicult ground with medium or high reactivity
levels.
So do not just rely on performance in optimal conditions.
Depending on the reactivity level, you will notice that the length of the audio signal varies
when it passes over a target:
Low reactivity (-2, -1) = long sound High reactivity (1, 2, 3) = short sound
Evidently the length of any false signals (the crackling of iron for example) will vary proportionately
as well.
You are therefore advised not to constantly change the reactivity level, as this may interfere
with your ability to distinguish good and bad sounds.