Tiger Shark Operation Instruction Manual
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21/06/2007 14:32
make the circuitry more susceptible to interference. A number of outside conditions such as power lines,
highly mineralized soil and wet salt sand can cause interference. The Sensitivity control is used to raise
or lower the power to the operational amplifiers, which changes the gain. Gain is the measurement of
how much a signal is amplified. The higher the gain, the more depth and sensitivity to small objects a
detector has. Unfortunately, any small interference that is amplified can cause the detector to become
erratic. The Sensitivity control is used to find the best gain setting in any location without letting the
detector become unstable.
Turn the TUNE SPEED switch from ALL MET FAST to MOTION DISC. With the case open, place a
slight pressure on the battery pack and wait for the battery test to finish. When the battery test is done,
you will not hear any sounds in your headphones until you pass a target in front of the coil. Using your
screwdriver turn the potentiometer clockwise to increase the gain and counterclockwise to decrease the
gain. Take some time to try waving targets in front of the coil with different sensitivity settings. Notice
that with a higher sensitivity setting, the farther away from the coil a target can be and still get a
response. Please note that your detector will probably "chatter" at maximum sensitivity. This is normal
and will not hurt your detector. The best setting is to set the Sensitivity control to a point just before the
detector starts to chatter.
Perform Air Test in MOTION DISC Mode
As discussed before, the Discriminate Mode is used to filter unwanted targets from good targets. The
principle behind this is pretty simple. The detector sends out a signal and then receives it back creating a
small electronic field. As metal passes through the field that the detector generates, it causes a change in
the received signal. The amount of change that each type of metal causes is fairly constant; therefore, we
can tune our detectors to miss the targets that we don't want to find. The change is based on the type of
conductivity that each target has. The general list of targets is as follows: iron, foil, nickels, gold jewelry,
pull tabs, screw caps, pennies and silver coins - starting with dimes and working up to silver dollars. This
list is meant to be a guide only. There is a point that some gold rings and some pull tabs overlap. Also,
the depth of the target and its orientation in the ground can change the received signal. A coin that is flat
to the coil will produce a better signal than a coin that is on edge. Take some time now to try different
combinations of depth and orientation of your targets and find out how your detector responds.
We are now ready to discriminate targets from each other. We
will start with the DISC LEVEL at zero. Wave the targets one at
a time at least 2 1/2 inches away from the coil. All four targets
(the iron, nickel, pull tab and quarter) will respond with a good
audio signal. Next, we will turn the DISC LEVEL up to
approximately 3 or 4 (2 or 3 in the SALT Mode). This should
be high enough to knock out the iron target and still get a
positive response on the nickel, pull tab, and quarter. When you
are done with the iron target, turn the DISC LEVEL to
approximately 6 or 7 (4 or 5 in the SALT Mode). This level is
high enough to knock out the nickel. At this time the iron target and the nickel should give no response,
while the pull tab and quarter will give a solid response. Next, turn the DISC LEVEL to approximately 7
1/2 or 8 1/2 (7 or 8 in the SALT Mode). At this time only the quarter should respond with an audio
signal. Now roll the DISC LEVEL all the way to MAX. Notice that the quarter is still responding. The
discrimination will not go high enough to lose most silver coins.
This air test was designed to show you how the MOTION DISC Mode works. Each machine may be a
little different than all the others, so you may want to take some time and try different targets to find the
