Tesoro Cibola Getting Started page 6

Turn the SENSITIVITY knob from OFF to about 7 or 8. You will hear a series of quick beeps. If
the battery is fully charged, you will hear 6 or 7 beeps. When you hear only 1 or 2 beeps, it will
be time to replace your battery. This test is only performed when the detector is first turned on. If
you would like to check the condition of your battery while hunting, turn your detector off and
on again and listen to the beeps.
Adjust THRESHOLD
To adjust the threshold tone, push and hold the PINPOINT button and then turn the
THRESHOLD knob clockwise until you hear a slight but steady tone. You will have to turn the
knob to somewhere between the 10 o'clock and 3 o'clock position to get the best hum. Once you
have set the THRESHOLD, release the PINPOINT button. This will put you back into the
DISCRIMINATE Mode and you can continue with the Quickstart.
The purpose of the threshold tone is to give a reference to judge targets for pinpointing and to
super tune the Cibola. (For more information on super tuning, see the "Super Tune Your Cibola"
section on page 13.)
In the field, some targets may be small enough or deep enough that they will not be able to
generate an audio signal by themselves. By monitoring a threshold tone, you already have an
audio tone so changes are easier to hear. However, if the threshold is set too 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, meaning that no sound will be heard until the
coil goes over a target. The most common use of the detector is to hunt in the DISCRIMINATE
MODE and push the PINPOINT button to pinpoint a target. This will give you the advantage of
ignoring unwanted targets and not having to listen to the threshold hum until you are ready to
pinpoint and dig a target.
The all metal circuit uses a single channel to detect various metals. The discriminate circuit uses
two different channels, then amplifies and filters them. The detector will then compare the
signals and determine whether or not to beep at the target. While there is a great advantage to
ignoring unwanted targets, it can 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 knob is used to raise or lower the power to the operational amplifiers, which
changes the gain. Gain is a 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.