Fisher Lab CZ-21 QuickSilver Operating Manual page 16

GROUND BALANCING
4. With a little practice, you should be able to ground
NOTES:
1. If you get an audio response as you first lower the coil with
the GROUND control at 10, you're probably over a piece of
metal. Move and try again.
2. lf you get a sudden bell tone, not preceded by an increasing
audio response, you're probably in some very highly
mineralized soil or sand. Instead of lowering the coil to an inch
or two above the ground (as in step 2 above), stop just before
you hear the bell tone and ground balance as instructed.
Maintain that coil height as you search.
3. If you don't get an audio response, or if the hum stays the
same no matter where you set the GROUND controls as
you bob the coil up and down, you're probably in an area
where there's very little ground mineralization. Just leave the
GROUND control at "10" and begin searching.
4. Recheck your ground balance occasionally.
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balance quickly by "bobbing" the coil up and
down in a continuous movement as you adjust the
GROUND control with your thumb.