Setting Up; Tuning - Fisher Labs M-97 Operating Manual

SETTING UP

The M-97 comes ready to use.
Extend the lower stem of the M-97 so that the search coil rests be-
tween 6 to 12 inches in front of your feet. Your arm should be straight
and relaxed with your grip held loosely.
Tighten the locking nut/compression nut 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 nut
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.
Check the batteries by turning the Mode control to Battery Test posi-
tion and turning the Ground control to any number. A reading between
80 and 100 indicates the batteries are OK.
*With the 11" coil you must slide the lower stem completely out of the
upper assembly for the M-97 to properly fit in the hard carrying case.
TUNING THE M-97
There are two methods to tune and balance the M-97. One method is for
quick and easy operation; the other will allow you fine tune the detector
for deeper searching and greater sensitivity.
Turn On and Go Method
Select an area that is free of metal near and under the search coil.
Turn on the M-97 by setting the Mode control to "Normal" and Ground
control to the position "5". (Hint: If the M-97 is loudly sounding when the
instrument is turned on, press and release the Retune Button to quiet the
instrument). Raise the search coil about 12 to 18 inches above the ground
(dirt, concrete, asphalt, etc.), and press and release the Retune Button.
Lower the coil close to the ground. There should be little or no change
in the tone of the detector. If the M-97 changes tone when the coil is
lowered to the ground, there is either a metallic object near the coil that
is causing the instrument to respond, or the soil conditions are such that
the M-97 needs to be more precisely balanced.
Proceed with locating your targets.
Precision Tuning Method
(This method can be used for the "Normal" setting, and must be used
for the "High" setting).
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