7
USAGE TIPS
TONE RESPONSE
With practice in the field, you will learn to classify buried objects
according to the different tones and the clarity and repeatability of the
tones.
Only dig up targets that induce repeatable tones. Each time you pass the
search coil over a possible target, you should hear the same tone. If the
tone does not repeat on each pass, varies in tone, or varies in location,
then the target is USUALLY not of value.
Inconsistent tones are evidence of high oxidation (rusted metals) or
irregularly shaped objects. Note, however, that multiple tones may be
evidence of multiple targets. If you cannot pinpoint the location of a very
strong signal, lift the coil higher off the ground until a weaker, but more
precise signal, is heard. For very weak signals, try moving the coil in
short, rapid sweeps, close to the ground.
PINPOINTING
Accurate pinpointing takes practice and is best accomplished by "X-ing"
the suspected target area.
1.
When a buried target is identified by a repeatable tone response,
continue sweeping the coil over the target in a narrowing side-to-
side pattern.
2.
Take visual note of the place on the ground where the "beep"
occurs.
3.
Stop the coil directly over this spot on the ground.
4.
Turn your stance 90
degrees, facing the
target from a different
angle.
5.
Sweep the coil back
and forth, making
visual reference of the
intersection of these
two sweep paths.
6.
If necessary, "X" the
target at different
angles to "zero in" on
the exact location on
the ground at which
the beep occurs.
When pinpointing a target, try drawing an “X”, as illus-
trated, over where the tone is induced.
