6
M-66 SPECIFICATIONS
Search Loop Configuration ... Double D (direct wired)
Output Frequency of Loop .... 4.5kHz,
Output Indication .................... Speaker 16 ohm impedence
............................................ Audio fequency 450 Hz
Power Supply ........................... 9V, each
Power Consumption ............... (-9V) 17 mA
............................................ (+9V) 4mA min, 6 mA sound
............................................ threshold, 125 mA max sound
Weight with 8” coil .................. 4.25 lbs.
Operating Temp ...................... -4
0
to +158
0
F (-20
0
to +70
0
C)
............................................ search loop immersible in water
Dimensions ............................... Length 28” to 48” adjustable
............................................ (71cm to 122 cm)
Shipping Weight ...................... 7 lbs.
Shipping Dimensions ............... 34.75” x 12.75” x 5.25”
............................................ (88.3 x 32.4 x 13.3cm)
Subject to improvement or modification without notice.
Fisher Research Laboratory does not warrant suitability to specific use. Fisher Research
Laboratory shall in no event be liable for any direct, incidental, consequential or indirect
damages.
3
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 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
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 threshold 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.
M-66 CONTROL PANEL
The M-66 Control Panel.
