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M-66 SETTING UP
The M-66 comes ready to use.
Extend the lower stem of the M-66 so that the search coil
rests between 6 to 12 inches in front of your feet. Your arm should
be straight and relaxed with your grip held loosely.Tighten the
locking knot at the bottom of the upper stem.
When the proper length is selected, the excess cable should be
wound around the stem. This can be done by slightly loosening
the locking knot and turning the lower stem, or by removing the
search coil and winding the cable by hand. Be sure to leave a
some slack in the cable.
M-66 TUNING
Select an area that is free of metal near and under the search
coil.
Turn the M-66 on by setting the Ground control to the position “5”. If
the M-66 is sounding, turn the Tuning control counter-clockwise until
the sound vanishes. In the same respect, if you have no sound then
turn the tuning control clockwise until the needle moves to about
“10” and the sound is heard
NOTE: the tuning control is a multtiturn control
Check the batteries by pressing the Battery Test button. A reading
between 80 and 100 indicates the batteries are OK.
Set the coil on the ground. Adjust the Tuning Control (turn knob
clockwise) so there is a slight threshold sound, and the meter reads
10.
Lift the coil approximately 12 inches off the ground.
Note any change of sound. If there is no change, the M-66 is bal-
anced and ready to search. If the sounds changes:
Sound increases – Increase the Ground setting. Repeat above
procedure.
Sound decreases – Decrease the Ground setting. Repeat above
procedure.
Repeat until the no change of sound occurs.
Proper tuning is essential for accurate locating.
M-66 SEARCHING
It is a good idea to establish a methodic search pattern. Avoid
swinging the M-66 like a golf club, swing the detector side to side
keeping the search coil the same distance above the ground.
Your sweep pattern should be a slow, half-circle motion. If you
are searching for a small target, it is a good idea to overlap your
sweeps.
When the detector’s search coil starts to pass over a metal ob-
ject, the sound will increase and the meter readings will increase.
Depending upon the size and depth of the target, the target
may appear (respond) to be larger then it should. To get a visual
outline of the target, you need to reduce the sensitivity of the
M-66. An easy way to do that is to raise the coil and pass over
the target. This can help establish the edges of the target.
Another method that will give a visual outline is to reduce the
Tuning Control (sensitivity) of the M-66. Move the coil away from
the target. Reduce the Tuning Control (turn counter-clockwise)
approximately ¼ of a turn. Sweep across the target area. The
sound and meter readings will be more responsive as the search
coil passes over the target. You may need to repeat this step
more times if the target is at a shallow depth. Be aware that
you can loose responsiveness of the target by over reducing the
Tuning Control (sensitivity) of the M-66.
