User's Manual

5
The LORENZ DEEPMAX Z2 is based on the non- mo-
tion; Pulse GBS (Ground Balancing System). Short
and intensive magnetic pulses are emitted by
means of a search coil rst. Those magnetic pulses
produce eddy currents in conducting materials like
metal objects for example. Said eddy currents will
be kept in a metal object and will die away after
the magnetic pulse emitted by the search coil has
turned o. This is the reason why it is possible to
detect those eddy currents during the time delayed
receiving phase by means of the same search coil
which now acts as a receiving coil. A rather com-
plicated electronics circuitry is necessary to detect
those tiny voltage changes and has to separate that
particular signal from interference also received.
The signal has to be amplied to drive an audio
stage with voltage-controlled oscillator (VCO),
which emits an audible signal either by headpho-
nes or built-in loudspeaker when a metal is in the
near of the eld of the search coil.
Eddy currents produced in a metal object by means
of a pulsed primary eld, will die away dierently
depending on the conductivity of the metal object.
The metal classication circuit therefore gives a
visual time delay reading for the eddy currents
received over a certain period of time. In addition,
a ferrous/ non- ferrous indication for a metal being
detected is working when a double D coil is in use.
This gives further information on the probable kind
of metal being located as well as the audio sound
emitted, which makes it easy to predetermine the
exact place and the size of the buried metal object.
The Pulse GBS principle has got the advantage of
using large diameter coils and high transmitting
power. This is especially necessary when searching
at depth. Frame mounted cable coils of dierent
size and shape can be connected to the LORENZ
DEEPMAX Z2 without any adjustments. A special
adaptation circuit has been added to the detector
to suit with ve dierent coil systems automati-
cally. This ensures best performance with any coil
connected. When enlarging the search coil diame-
ter, the sensitivity to bigger objects will also rise. At
the same time smaller objects will be located less
sensitive. It is possible to eliminate some unwanted
objects like nails and foils or to identify them as
being small unwanted objects while searching for
bigger and deeper objects. Even in dicult soils
where magnetic iron oxides are present the LORENZ
DEEPMAX Z2 will oer extreme depth capabilities
for both ferrous and non-ferrous metal objects
when the Ground Balancing System is in use. Other
systems often suer from ground eects which
reduce the depth range in the ground.
The LORENZ DEEPMAX Z2 will be able to locate
objects at almost the same depths either in most
types of ground or »in air tests«. The high sensitivity
of the DEEPMAX Z2 to non- ferrous metal objects
like gold, silver and copper together with the metal
analysis make this detector an outstanding device
for many dierent locating purposes.
The DEEPMAX Z2 gives a visual indication on the
LC Display for every metal being located. This time
delay reading producing a number between 000
and 099 helps to classify metal objects. The metal
classication circuitry is only in some cases aected
by the size of a metal object and therefore identies
small coins as well as large pieces of metal. The LO-
RENZ DEEPMAX Z2 also oers a sophisticated and
rened ferrous / non- ferrous metal analysis which
works more stable on dicult soils in conjunction
with the 26cm or 35cm double D search coil. De-
tection depths achieved in air tests are almost the
same in many types of soils and therefore consi-
derably higher than those possible with standard
pulse induction or sine wave VLF - TR Detectors.
The DEEPMAX Z2 was developed to provide a num-
ber of features including high sensitivity and sta-
bility together with easy operation. The amount of
2. FUNCTION / APPLICATIONS