Turn On Procedure; Ground Reject Procedure - Fisher Gold Bug Operating Manual

TURN ON PROCEDURE

GROUND REJECT PROCEDURE

When your Gold Bug is properly "ground adjusted", it will have
only a minimum response to ground minerals when the search
coil is raised or lowered. Precise adjustment of the GROUND
REJECT control is critical. The higher the ground mineralization or
Sensitivity setting, the more critical it is. Each operating mode
requires its own ground reject adjustment, however for all
practical purposes you need set it only in the mode you'll be
searching in. It will be close enough for a quick check or
pinpointing in one of the other modes or at worst, require only a
quick fine tuning.
1. Set your controls as follows:
MODE = Auto-Tune
SENS = 7
GROUND REJECT = 5
2. Hold the search coil waist high, away from any
nearby metal.
3. Turn the volume on to 10. A short loud squawk is
normal so if you're wearing headphones, start the
volume at zero and let the audio settle down
before increasing it to a comfortable level when
the coil is passed over a large or shallow target.
4. With the coil still in the air, rotate the THRESHOLD
control until you hear a very faint hum. This is the
Audio-Threshold tone you'll need to maintain for
optimum performance in either the AUTO-TUNE or
NO-MOTION modes. Once you've set it you won't
have to adjust the THRESHOLD control very often.
NOTE: The Audio-Threshold tone may sound a little
scratchy or more like a buzz than a hum. This is a
normal consequence of the extreme sensitivity of
the Gold Bug, particularly at high SENS settings or
near power lines.
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