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M-66
Valve and Box Locator
(Metal Detector)
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
Operating Manual
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CONTENTS
Description ..................................................................................pg. 2
Control Panel .............................................................................pg. 3
Setting Up ....................................................................................pg. 4
Tuning .........................................................................................pg. 4
Searching ....................................................................................pg. 5
Specifications .............................................................................pg. 6
Warranty ..........................................................................Back Cover
DESCRIPTION
The Model 66 Valve and Box Locator (M-66) offers the utility industry an uncomplicated detector for finding buried metal objects.
This all-metal metal detector can even search through concrete
and asphalt. Please note that the M-66 is a Metal Detector which
should not be a substitute for a Utility Line Tracer. Fisher Research
Laboratory manufactures a complete line of equipment for Line
Tracing.
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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.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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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
Proper tuning is essential for accurate locating.
1. Select an area that is free of metal near and under the search
coil.
2. 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
3. Check the batteries by pressing the Battery Test button. A reading between 80 and 100 indicates the batteries are OK.
4. 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.
5. 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.
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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 object, 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.
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M-66 SPECIFICATIONS
Subject to improvement or modification without notice.
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 +1580F (-200 to +700C)
............................................ 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)
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.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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8700005000 Rev.2 01-21-11
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
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