Control Panel - Fisher Labs M-66 Operating Manual

M-66 CONTROL PANEL
4
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.
The M-66 Control Panel.