QED PL3, Owner'S Manual, Page: 18 / 56

18
2. THRESHOLD B – (THS-B) (BIAS)
Setting range 1-99
Factory preset at 50
Description
A small target will produce a rising pitch signal and a large target will
produce a falling pitch signal.
THS-B can be used to provide selective ("BIASED") enhancement for
either small (rising pitch) or large (falling pitch) targets.
THS-
B (Bias) is used to set a ‘hair trigger’, such that less signal
strength is needed to produce a good audible signal.
Note: THS-A (All) does the same thing but affects both large and small (falling
& rising pitch) targets equally.
Lowering THRESHOLD B will accentuate rising pitch targets
(generally a small target).
•
When prospecting for fine gold, fit a small coil and adjust
THRESHOLD B accordingly to suit the coil using a known
specimen target.
Raising THRESHOLD B will accentuate falling pitch targets (usually
large targets).
•
When prospecting for larger specimens fit your selected coil and
adjust THRESHOLD B to suit your selected coil.
Note: BIAS can change slightly overtime depending on temperature.
Note: When the detector is Ground Balanced the audio volume will be very low.
Navigating to Threshold B
Select Menu Option #2, then press the button to open the
Threshold B setting.
Threshold Definition
Threshold is the
audible audio floor
that is set just above
‘silent’, so that the
operator can hear a
threshold just above
the prevailing
external conditions
(wind noise, ground
conditions, etc)
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