Selecting The Proper Operating Mode - Tesoro Stingray II Operator's Instruction Manual

the motion discriminate mode.
NOTE: The following three controls are mounted inside the control housing, since they are seldom used
controls and do not need constant adjustment.
5. Threshold Adjust. This control is used to adjust the threshold (the beginning of sound) for the two non­motion
modes. Threshold should be adjusted with the coil in the air, the tune speed switch on fast, and the mode switch in TR
disc or ALL METAL position. Adjust so sound is very low ­ just barely audible.
6. Volume. This control adjusts the volume of the loudest sound to be comfortable to the user. If the loudest sounds
are too loud, you may become weary of using the detector, and if they are not loud enough, you may miss the deepest
targets.
7. Motion DISC Sensitivity. This control should be set as high as possible (clockwise direction) while still allowing
quiet operation. When it is set too high, false signals may become predominant, which may reduce your ability o make
out the faint deep target signals.
TUNING THE STRINGRAY II
The Stingray II, like other high power metal detectors, will give much better performance if it is properly tuned. To achieve
maximum performance from your Stingray II, be sure that you understand the following sections of the manual and that you
use it in the best mode for the site you are hunting.
1. Tuning In The All Metal Mode
The Ground Adjust control is located on the front panel and is not designed to be used as the ground adjust control would
normally be used on a land based metal detector. It should be set t the best setting for the areas that you work and then left
alone.
The Ground Adjust control should be set so that the most negative mineral backgrounds that you will be detecting in
response with a slight positive increase in volume as the searchcoil is lowered to the ground. This will yield the best results
when the detector is used in the motion discriminate mode by keeping the detector from responding to negative minerals or
from detecting a hole in the ground.
The Ground Adjust control doesn't have enough range to neutralize salt water beaches. Salt water beaches are always
very positive, so the TR discriminate mode should be used with the Disc Level control being set to neutralize the conductive
nature of the beach.
1. Put the On/Off control to fast and the Mode select switch to ALL METAL. Hold the searchcoil about two feet above
the ground and rapidly lower the searchcoil to about two inches above the ground.
2. If there is no change in the Threshold sound, or only a slight positive increase, the detector is properly tuned. If the
sound decreases, the ground adjust should be turned slightly clockwise (in the direction labeled Max). If the sound
increases dramatically, turn the ground adjust slightly counterclockwise.
3. Repeat the above step until the threshold doesn't change or until there is a slight positive increase in the threshold
sound.
2. Tuning In Motion Discriminate Mode
Using the detector in Motion discriminate is simply a matter of setting the Disc Level control to the desired position. The
detector should not be affected by mineralization, unless it is quite severe. A slightly improvement in response may be noted
by reducing the Sensitivity Control on the inside of the housing.
NOTE: Be very careful not to get any sand or dirt particles on the front edge of the housing or onto the O­ring
in the panel. Any particles in this seal can cause the detector to leak when it is submerged. When closing the
housing, operate both draw bolts at the same time, rather than clamping one side and then the other. From time
to time, you should apply a bit of O­ring grease to the panel O­ring seal.
3. Tuning In TR Discriminate Mode
The TR discriminate mode will probably be unusable in virtually all land locations due to mineralization levels. It may be
the most useable mode on certain salt water beaches, however, but only if the discriminate level control is set to neutralize
the effects of the combined mineralization and conductive salt water. This obviously means you cannot use the Disc Level
control to eliminate any trash items, since you must used it to eliminate mineral effects.
It will probably be best to try using the Motion discriminate mode on salt water beaches since you can use the entire
range of the Disc Level control to eliminate some of the more prevalent trash.
1. Turn the ON/OFF control to the fast position and the Discriminate Level control to about mid­range. With the Mode
switch in the TR Disc position, hold the searchcoil about two inches above the ground.
2. Rapidly raise the coil about two or three inches. If raising the searchcoil slightly makes the threshold sound increase
to maximum, the mineralization level will probably make the TR discriminate mode very difficult to use. You must be able
to sweep the coil from side to side and still maintain the threshold sound. Attempting to operate in TR discriminate in
heavily mineralized ground will almost always cause a large decrease in depth.
3. On a salt water beach, the discriminate level control can be used to essentially ground compensate the detector if it
used in the TR discriminate mode. It will be best to adjust the Disc Level control for a slight increase in sound as the
searchcoil approaches the wet salt beach.
SELECTING THE PROPER OPERATING MODE
The TR discriminate mode will probably be unusable in most land areas due to the mineralization levels encountered.
However, the TR discriminate mode can be quite possibly the best choice to use on a salt water beach because the Disc