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The SENSITIVITY knob is numbered from MIN to 10 and then has an orange area called the 
Max Boost zone. For normal hunting, anywhere in the numbered zone will work very well. 
However, the Max Boost will allow you to increase the power to the operational amplifiers to the 
point of overload. This may cause your detector to become unstable and force you to turn the 
SENSITIVITY knob to a lower setting. An overload situation will not hurt your detector, but it 
will maximize the gain that is used by your detector. This can, in certain conditions such as low 
mineralization in the soil, cause your detector to penetrate deeper into the ground and become 
more sensitive to small targets.  

Take some time to try waving targets in front of the coil with different sensitivity settings. Notice 
that the higher the sensitivity setting, the farther away from the coil that a target can be and still 
respond with an audio signal.  

Perform Air Test in 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 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 conductive targets is as follows: iron, foil, nickels, gold jewelry, pulltabs, screw tabs, 
pennies, and silver coins starting with dimes and working up to silver dollars. This list is only 
meant to be a guide. There is a point that some pulltabs, nickels, and gold jewelry 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 to 
try different combinations of depths and orientations 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 
DISCRIMINATE LEVEL at MIN. Please notice that the DISCRIMINATE LEVEL knob has 
words that correspond to the items that are discriminated out.  

All four targets (the iron, nickel, pulltabs, and quarter) will respond with a good audio signal at 
the MIN setting. Next, we will turn the DISCRIMINATE LEVEL up to IRON. This should be 

Summary of Contents for Cibola

Page 1: ...rchcoil With 3 Cable and Scuff Cover 1 9 Volt Alkaline Battery 1 Operator Instruction Manual 1 Tesoro Warranty Card If any of these items are missing contact the Tesoro Authorized Dealer where you pur...

Page 2: ...iding the battery door upward in the direction of the arrow Check the polarity on the battery and on the diagram inside the battery compartment Make sure that they match and simply drop a fresh 9 volt...

Page 3: ...ies into place Tighten the pole lock to secure the two assemblies together 6 Slide the lower pole into the middle pole until the spring buttons click into the first set of adjustment holes Turn pole l...

Page 4: ...vement is often called a sweep The searchcoil should not touch the ground during your sweep The pole length should be adjusted to allow this without having to lift the detector with your elbow or shou...

Page 5: ...3 A nonmetal table top or counter Here s what you will do 1 Perform Audio Battery Test 2 Adjust THRESHOLD 3 Adjust SENSITIVITY 4 Perform Air Test in DISC Mode 5 Perform Air Test in PINPOINT Mode 6 Su...

Page 6: ...soft or too loud small changes in the signal will be hard to hear Take some time and find a threshold level that is right for you Adjust SENSITIVITY The discriminate circuit uses a silent search mode...

Page 7: ...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 th...

Page 8: ...ent Search Discriminate Mode Press the PINPOINT button and you will immediately hear the threshold audio tone This indicates that you are now in the ALL METAL Mode Your Cibola has a VCO style ALL META...

Page 9: ...machine as your detector Two machines that are on the same frequency will start broadcasting to each other This is called crosstalk If you experience crosstalk in the middle of a hunt just flip the FR...

Page 10: ...ab By switching back and forth between modes and comparing the target response sound in all metal to the target response sound in discriminate you can often better identify the likely location of the...

Page 11: ...not designed to withstand abuse In caring for your Cibola there are several important DO NOTs to remember DO NOT use it to pry rocks loose or to beat bushes out of the way DO NOT drop the machine into...

Page 12: ...oil is used in salt water rinse it and the lower stem assembly well with fresh water to prevent corrosion of the metal parts The searchcoil is waterproof but the electronics are not so always prevent...

Page 13: ...searchcoils ignore ground mineralization better than concentric searchcoils and may offer improved performance in extreme ground conditions Selecting the right optional searchcoil depends on factors...

Page 14: ...in permission prior to entering private property mineral claims or underwater salvage leases 4 Do not damage deface destroy or vandalize any property including ghost towns and deserted structures and...

Page 15: ...workmanship as long as it is owned by the original consumer purchaser This warranty is not transferable and is valid only if the warranty registration card has been completed and mailed within 10 days...

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