User's Manual
21
26CM DOUBLE D SEARCH COIL
A special double D version of the 26 cm diameter coil
with separate transmitting and receiving windings is
also available. This coil makes FERROUS / NON-FER-
ROUS indications on the display of the DEEPMAX Z2
possible. Depending on the type of ground someti-
mes DD- coils are less aected by extremely minera-
lized soils but pinpointing will be more dicult than
with a single loop coil.
26CM DIFFERENTIAL SEARCH COIL
This particular search coil consists of three coils
inside. A special circuitry of this coil and the Z2 with
its high precision dierential input, subtracts the si-
gnals of two coils in order to eliminate interferences
from power lines or radio transmitters. Even signals
from magnetic soils are eliminated as long as the
coil is hold in parallel to the ground.
Compared to single coils the sensitivity to bigger
metal objects is reduced. In most cases however the
reduction of sensitivity is often accepted due to the
stable and accurate operation in areas with plenty
of electromagnetic interferences.
Compared to single coils this coil design will give
a completely dierent signal response with two
indications at the sides and a minimum point in the
center of the coil. On the display beneath the main
bar graph there is a +/- indication which will come
on for easy pinpointing when this dierential coil
has been connected.
35CM SEARCH COIL
This highly sensitive search coil has got very good
depth capabilities on single coins and medium
sized objects. Nuggets smaller than 5 mm in diame-
ter should rather be detected with a 26 cm search
coil than with this coil due to poor sensitivity to
very small metal bits and pieces. A telescopic pole
with armrest is necessary for any of the small search
coils (26 / 35 / 44 cm).
35CM DOUBLE D SEARCH COIL
Separate transmitting and receiving windings
oer more stable operation on soils with changing
contents of iron oxides (minerals). The FERROUS /
NON-FERROUS metal identication does work with
these 26 cm and 35 cm double D search coils. It is
simple to locate small coins with this search coil.
When expecting very small coins or nuggets a 26
cm single coil is a better choice.