O R E N Z
P U L S E 5
28
Connect the searchcoil-connector to the coil-jack and
fasten the plastic sleeve of the connector by rotating
it clockwise. Set mode-switch at position batt. The
needle of the meter should rest near 100 and the red
battery indicator should be off. If the meter displays
a number lower than 50 or if the red light comes on,
the detector should be turned off and immediately
be recharged with the supplied recharger. The battery
condition should be checked via the meter during
operation in the batt.- mode (see chapter 7).
Now turn the mode-switch to the disc position. The
built-in discriminator is now selected. Set the audio
and freq. control to mid-position and retune the
detector with the zero-control. The searchcoil therefore
has to be hold constantly over the ground and the
zero-control must be pushed for about three seconds,
until the preselected audio ticking sound is audible.
Important note:
With every retuning process one
should pay attention that no metal is in the near of
the searchcoil while pressing the zero-pushbutton.
It is therefore necessary to hold the searchcoil far
away from metal objects and the electronics control
box itself.
During operation no metal buckles or shoes should
be worn. The same with keys, coins, rings and
watches. Every metal carried by the operator can
cause false signals, especially when they are near
the searchcoil. Therefore the electronics control box
has to be carried far away from the searchcoil, this
is especially important while searching with the large
frame mounted coils. Never use any metal screws
when building frames for the universal cablecoils.
The loudspeaker will give one ”tick” every 1-2 seconds
after having retuned the detector correctly with the
zero-control. The ”ticking-rate” can be individually
tuned from silent to a low frequency threshold tone
with the audio-control. This preset audio tone will be
recalled every time the zero-push button is operated.
As the LORENZ PULSE 5 offers it's highest sensitivity
with correctly tuned electronics, one should check
the threshold tone from time to time during operation.
A threshold tone with a ”ticking-rate” will give the
operator the information that the detector works with
it's highest sensitivity.
Especially for target classification purposes the
electronics need to be tuned for best results (see
chapter 5).
The detector is now ready to 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 it's highest
frequency when the searchcoil is directly over the
target. The center of the searchcoil is the part with
the highest sensitivity. Even in the direct near of the
target frequency changes make pinpointing possible.
The detector works with it's highest sensitivity in
position Disc and 1. when changing the searchcoil or
when selecting a different position with the mode
control, the electronics need always to be retuned
via the zero-control. When lowering the searchcoil
to the ground especially in position disc and 1 an
audio sound may appear, which can be cancelled by
pressing the zero-pushbutton again. The distance
between the searchcoil and the ground has to be
kept at a constant height when searching after having
done this.
Large diameter coils like the frame mounted cablecoils
should be hold at heights of 4”-24” inches
(10-60 cm) over the ground to ignore magnetic
mineralized ground. Those coils should be moved
slowly without any jerky movements, parallel to the
ground and at constant height.
When mineralized ground conditions or very strong
signals are expected it may be advisible to select a
higher delay setting with the mode control at position
2 or 3.
In position 3 and especially while using large Diameter
frame coils the sensitivity to very small objects
significantly decreases. This is in many cases
desireable. The simplest way to ignore small metal
objekts is to increase the distance between the
searchcoil and the ground. Simply raise the loop and
it will still be possible to locate those deeper bigger
targets. In position disc the target-conductivity can
be measured (see chapter 5).
Note:
The LORENZ PULSE 5 metaldetector has to be
retuned with the zero control every time the mode
control has been switched to a different position, a
different coil has been connected or the detector has
been turned on again. Therefore the zero-control
has to be pushed for about three seconds. During
operation only very few threshold corrections are
necessary.
In position 2 and 3 the LORENZ PULSE 5 works with
less sensitivity. Position 1 and disc offer the greatest
sensitivity especially for very small non-ferrous metal
objects like coins and nuggets for example. In position
1, 2, 3 no target-classification is possible, but an
intensity meter indication which displays the signal
strength in parallel to the audio sound.
4. Operating procedures I
