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M-66 CONTROL PANEL
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 accu-
racy may be in question.
When searching with the M-66, the meter gives a
visual indication to any change occurring in the
field of detection. 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 compensate
for the natural mineral content of the soil or ground
surface. When tuned properly, raising and lower
ing 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.
The M-66 Control Panel.
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