30
FINE TUNING EXERCISE
An exercise to
show how
Threshold A
(Volume) and
Threshold B (Bias)
work/interact.
•
Attach a small coil, 8” diameter or less.
•
Obtain a small shotgun pellet or similar size nugget and a $1
Australian coin.
•
Set:
o
MODE to 1
o
GAIN to 4
o
THS-A (Volume) to 30, and
o
THS-B (Bias) to around 50.
•
Ground Balance the detector.
•
Make certain there are no metal targets in the ground and place the 2
targets about 3 feet apart.
•
Swing over both targets and note the signals.
•
Reduce THS-B until the threshold audio signal volume is as high as
tolerable and swing coil over both targets again. You will notice that
the small target signal will be enhanced when compared with the
previous signal response.
•
Increase THS-B through and past the null point (around 56) until the
threshold audio signal volume is as high as tolerable and swing coil
over both targets again. You will notice that the large target signal will
be enhanced when compared with the previous signal response.
•
Set THS-B to null point (around 50) and raise THS-A until the
threshold audio signal volume is as high as tolerable.
•
Swing over targets again.
•
Increase MODE and GB then repeat entire procedure and taking note
of which MODE number gave the best result.
Summary of Contents for QED-PL2
Page 18: ...18 2 THRESHOLD B THS B BIAS Setting range 1 99 Factory preset at 50 Notes ...
Page 34: ...34 NOTES ...
Page 35: ...35 ...
