User's Manual

10
GROUND BALANCE
Ground balance can be performed in three ways with the INVENIO:
Automatic, Manual and Tracking.
The ground balance screen is a separate window in detection screens
(except for the Ground Anomaly & Cavity mode). In the detection screen
with the IPTU sensor, you can remove the ground balance screen by
pressing the INFO button but it is fixed in the detection screen without
the IPTU sensor. The ground balance window is divided into 2 parts:
The top part shows the instant ground balance value changes while
searching and the bottom part shows the adjusted ground balance
value.
If the trigger is pushed forward while performing an automatic or
manual ground balance, the device will switch to All Metal mode
automatically on the background without any indication to the user,
regardless of the selected search mode.
Upon completion of ground balance, the ground balance value is shown
under ''Adjusted'' in the ground balance window.
Automatic Ground Balance
Automatic ground balance is performed as follows in all search modes:
1) First, find a spot of ground where there is no metal present.
2) Push the ground balance trigger forward and hold it. The ground
balance screen will be displayed automatically and the word
''Automatic'' will appear bigger on screen.
3) Hold the search coil parallel to the ground. Continue to push and
hold the trigger forward and start pumping the search coil up and
down from about 20 cms. (~8'') above the ground down to 5 cms. (~2'')
off the ground with smooth movements and keeping it parallel to the
ground (this is also shown by animation on the screen).
4) Continue until a beep, indicating the completion of ground balance,
is heard. Based on ground conditions, it usually takes about 2-4 pumps
for the ground balance to be completed.
5) When the ground balance trigger is released, the device continues to
operate in the All Metal mode for a short period of time and the ground
balance window stays on screen. The word ''Manual'' will appear bigger
on screen. This makes it possible to manually fine tune the automatic
ground balance value. Refer to the following "Manual Ground Balance"
section for further information regarding this feature. If no button is
pressed for a while, the device will revert back to the detection screen
automatically. If you do not want to wait for the timeout period, you
can switch to the detection screen by pulling and releasing the trigger
once.
6) Upon completion of the automatic ground balance, ground balance
value will be shown under ''Adjusted'' in the ground balance window
and it will be same as the ''Instant'' value. The device continues to
ground balance and produce a beep sound as long as you keep the
trigger pushed forward and pump the coil. In order to ensure that
the ground balance is proper, ground balance at least 2-3 times and
check the ground balance values on screen. In general, the difference
between the values shall not be higher than 1-2 numbers.
7) If you cannot ground balance, in other words, if no beep sound is
produced, it means that either the ground is too conductive or not
mineralized or there is a target right below the search coil. In such
a case, retry ground balancing at a different spot. If you still cannot
ground balance, read the section titled ''Important Details Concerning
Ground Balance''.
NOTE : If the Stabilizer value is set high, the device may not auto
ground balance. In such a case, go to the SETTINGS of the All Metal
mode and select Stabilizer. Lower the Stabilizer value first. After
ground balancing, set the Stabilizer value back to its original level.
Manual Ground Balance
Allows you to manually modify the ground balance value. It is not
preferred mostly because it takes time. However, it is the preferred
option in cases where a successful ground balance cannot be
performed using other methods or minor corrections are required for
the automatic ground balance.
INVENIO is designed to allow for automatic ground balancing
conveniently on any type of ground. Therefore, it is recommended
to perform automatic ground balance upon start up. However, the
ground may not be suitable for automatic ground balancing in some
cases and the device cannot ground balance on such grounds. For
instance, wet beach sand, soils containing alkali or salty water,
trashy sites, ploughed fields, highly mineralized grounds and grounds
with very low mineralization are not suitable for automatic ground
balance. In such terrains, you can perform manual ground balancing.
However, manual ground balance requires a skill which develops over
time through practice.
To perform manual ground balance :
1) First, find a spot of ground where there is no metal present and
switch the device to All Metal mode.
2) You need to listen to the sounds coming from the ground in order
to perform manual ground balance. Pump the search coil up and down
from about 20 cms. (~ 8'') above the ground down to 5 cms. (~2'') off the
ground with smooth movements and keeping it parallel to the ground.
If the sound gets higher when lifting off the search coil above the
ground, the ground balance value is too low, in other words, the effect
from the ground is negative and the ground balance value needs to
be increased by using the plus ( + ) button. On the other hand, if the
sound gets higher when lowering the search coil to the ground, the
ground balance value is too high, in other words, the effect from the
ground is positive and the ground balance value needs to decreased
by using the minus ( - ) button.