CONTROL FUNCTIONS
If the threshold level is set too low there is no audible background
signal and small target signals will not go above the threshold of
audibility (Figure 4.6).
HINT A soft audible headphone signal which is comfortable to listen
to for extended periods is recommended (Figure 4.7).
Volume
Figure 4.8
Sets a maximum limit on the loudness of the target signal obtained from a
large target. Refer to Figures 4.9 - 4.11. The dotted line in these figures
represents the level of volume set by the volume control.
• If the Volume is set to maximum (fully clockwise), the target signal is
unaltered and proportional to the target size and depth (see Figure
4.9).
• If the Volume control is turned down to half way, the target signal
is unaltered for a small target, but is limited for a bigger target (see
Figure 4.10).
• If the Volume were to be turned down close to minimum, it
potentially will limit all signals to such a degree that most targets will
be lost (see figure 4.11).
NOTE Threshold should be reset after adjusting the Volume level.
Figure 4.8 Volume control
Figure 4.9 Maximum volume
Figure 4.7 Threshold control just right
Figure 4.11 Minimum volume
Figure 4.10 Mid-range volume
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CONTROLS
P0533-A
Louder
Audible Signal
Small
Target
No Sound
Large
Target
Just Right
Audio
P0521-A
Volume
Louder
Maximum
P0508-A
P0534-A
Louder
Mid-range
P05035-A
Louder
Minimum
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