Interfacion QED-PL2, Owner'S Manual

Page: 15 / 35

15
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.
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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