O R E N Z
P U L S E 5
31
Especially when expecting very strong signals and
mineralized grounds it is often advisible to retune
the detector in the ”air”. Afterwards the coil can
be lowered to the target from the top. This will
help to ignore magnetic soils, because the coil is
at least 8” inches (20 cm) above the ground and
therefore out of the range of the ground.
This will increase the perfomance and accuracy of
the LORENZ PULSE 5 and makes it easier to locate
and identify those targets.
When expecting very deep targets it will sometimes
not be possible to perform a meter reading because
the meter indication is always about 30-50 % less
sensitive than the audio signal from the built-in
speaker or headphones.
Note:
Some smaller pieces of bronze may be
indicate with a conductivity meter reading between
50-60 namely the same as some ferrous metal
objects. The LORENZ PULSE 5 does not suffer from
anomalous effects like VLF-TR-sinewave detectors
do. Therefore very big ferrous metal objects will
not cause a higher meter reading than 50-60 in
most cases. If ferrous and non-ferrous metal
objects are simultaneously located by the search-
coil the target classification circuitry will display
the conductivity of the larger metal object on the
meter. The conductivity meter reading may also
lay between the two different kinds of metal.
The target classification of the LORENZ PULSE 5
will work with all available searchcoils. The
universal-searchcoil-cable should not have more
than three windings (turns) for identification
purposes. It is often helpful to start with ”in-air”
tests in order to see how the LORENZ PULSE 5
responds to different metals.
In position disc the audio is necessary to find the
center of the target. The searchcoil therefore has
to be crossed directly over the target in order to
find the point with the strongest signal. Highly
mineralized grounds, electromagnetic interferences
from powerlines or transmitters can course
unaccurate conductivity meter readings (see
chapter 8).
The LORENZ PULSE 5 is able to identify deeply
buried big metal objects and small objects near
the surface with different kinds of searchcoils.
Note:
When expecting heavily mineralized grounds
it is necessary to tune the detector with the zero-
button to the ground. Therefore the searchcoil
must be hold at constant height and at least
2” inches over the ground during the time the
zero-button is pressed down and when identifying
objects with the meter reading.
6. Searchcoils/Accessories
Different searchcoils can be connected to the LORENZ
PULSE 5 for special search and location purposes. In
general small searchcoils offer great detection depths
on small metal objects while large searchcoils offer
the highest possible detection depths on big objects.
The possible detection depths also depend on the
kind of metal, the shape of the metal object and
slightly on the type of ground below the searchcoil.
The low sensitivity for small metal pieces in
conjunction with the very high sensitivity for bigger
and deeper targets make the LORENZ PULSE 5
especially useful when using it with large frame
mounted searchcoils. The maximum detection depths
achievable with a 40'' x 40'' inches (1m x 1m) frame
mounted searchcoil are higher than 200'' inches (5m)
and can even be increased to 315'' inches (8M) when
enlarging the searchcoil to 80'' x 80'' inches (2m x
2m). Of course it will no longer be possible to detect
single coins or nails with those large frame mounted
searchcoils. In this chapter the different searchcoils
available with the LORENZ PULSE 5 are described.
(see chapter 11 for detection depths)
Conductivity
Possible
meter-reading Metal object
0-10
coin, ring, ringpull, aluminium-
foil, gold-coin
10-20
bronze-coins, silver-coins, nickel
20-30
softdrink-can, small pieces of
iron
30-50
ferrous metal objects, nails
50-60
iron-box, weapons made of iron
60-80
medium sized bronze, copper,
silver-objects
80-100
big bronze, copper, silver,
gold-objects
