Meter
The meter of the M-66 serves two purposes for
the operation of the machine. When used with
the battery test button, the meter gives a visual
indication of the battery strength. A reading
between 80 – 100 is desirable. If the reading
is below 80, search depth can decrease and
accuracy may be in question. When searching
with the M-66, the meter gives a visual indication
to any change occurring in the field of detec-
tion. This is primarily due to the coil passing over
a metal object, but can also occur when the
ground mineral conditions change.
Battery Test
With the detector turned on, depressing the
Battery Test button will indicate battery
strength.This is a no-load battery test.
On/Off Ground Rejection
This control turns the M-66 on and off. It is used
to electronically balance the M-66 to compen-
sate for the natural mineral content of the soil or
ground surface. When tuned properly, raising
and lowering the search coil above the ground
will not cause a change in the meter reading or
audio tone.
Tuning Control
This control is used to adjust the detector to the
thresh old point. This threshold point is a point at
which a very faint audio tone is heard and the
meter reads 10. The Tuning Control can also be
thought of as the Sensitivity control for the M-66.
4
M-66 CONTROL PANEL
The M-66 Control Panel.
5
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 up-
per 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 po-
sition “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 balanced 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.
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