Pulse Delay Control
The Impulse AQ Limited transmits a pulse and then, after a time delay, samples the
received signal. The
Pulse Delay
control can adjust this time delay from 7 µs to 11.5
µs. The lowest delay setting produces the greatest sensitivity to all targets, especially
small gold pieces. But a low delay is also sensitive to conductive salt water so for
wet sand or surf hunting, it may be necessary to increase the delay. Higher delay
settings progressively reject lower conductors, so if you want to primarily search for
high conductors, and eliminate foil and other small trash, then a higher setting is
appropriate. When hunting for jewelry, run the lowest possible delay that still has
good stability.
NOTE:
The
Pulse Delay
setting can alter the effects of the
Iron Reject
and
ATS
controls. Re-adjust as needed.
Volume Control
The
Volume
control adjusts the loudness of all audio responses. There is a trade-off
between a setting high enough to hear a faint deep target, but not so high that a
strong shallow target hurts your ears. It is good practice to lower the
Volume
before
turning on the detector, especially if you are already wearing the headphones.
Threshold Control
The
Threshold
control sets the level at which the background audio tone
(the “threshold” tone) is heard. In most cases, faint target signals are easiest to hear
when the
Threshold
is set to a low but clearly audible level. If the
Threshold
is too
low (especially “silent search”) then a stronger target signal is required to activate the
audio, resulting in a loss of depth. A high
Threshold
level can result in audio fatigue.
NOTE:
With the
Threshold
turned down, you will normally want to first adjust
the
Volume
for a comfortable level on a strong target response, then adjust the
Threshold
for a comfortable threshold tone level.
19
USER CONTROLS
(Continued)
