User's Manual

14
As the LORENZ DEEPMAX Z2 oers highest sensi-
tivity with correctly tuned electronics, one should
check the threshold tone from time to time during
operation. Although a constant ticking sound is not
always achievable, a threshold tone will give the
operator the information that the detector works
with its highest sensitivity.
Especially for metal classication and ground balan-
cing purposes the electronics need to be tuned for
best results.
The detector is now ready for use and will indicate
a metal object immediately with an audio sound
emitted by the way of loudspeaker or headphones.
The audio frequency will rapidly rise and attains its
highest frequency when the search coil is directly
over the metal. The centre of the search coil is the
part with the highest sensitivity. Even in the direct
near of the metal frequency changes make pinpoin-
ting possible in some tone modes.
When changing the search coil the electronics al-
ways needs to be retuned via the
ZERO control with
the two step ground balancing function as descri-
bed in chapter 3. If this is not performed the preset
ground values are in use. When lowering the search
coil to the ground an audio sound may appear,
this can be cancelled by pressing the
ZERO control
again shortly. The distance between the search coil
and the ground has to be kept at a constant height
when searching in DELAY modes afterwards. If too
strong signals from the ground are noticed simply
change from DELAY to GROUND functions, after-
wards there will be no or very week indications of
the ground. When working with small search coils
of up to 44cm diameter it is also possible to select
the AUTO function with AUTO 1 for slow and 5 for
very fast automatic tuning in order to retune the
electronics to changing ground conditions automa-
tically during operation. The search coil therefore
has to be moved to achieve a signal from metal
objects. When resting the coil over the metal the
AUTO function will cancel out the signal after a
certain time.
In the DEL modes large diameter coils like the
frame mounted cable coils should be hold at
heights of (10 to 60 cm) over the ground to ignore
magnetic mineralized ground or small unwanted
metal objects. Those coils should be moved slowly
without any up and down movements, parallel to
the ground and at constant height.
In the DEL 1 and 2 mode and especially while using
large diameter frame coils the sensitivity to very
small objects decreases. This is in many cases desi-
rable, although the general sensitivity will be less.
The simplest way to ignore small metal objects is to
increase the distance between the search coil and
the ground. Simply raise the loop and it will still be
possible to locate those deeper and bigger metal
objects.
Be always sure that there is a sucient distance
between the detector or Battery + GPS module
and the frame coil.