Doc. P/N:
WSP-009-008
Version: V1.3
Issue Date:
April 2014
50
If a power level is set out of sequence, for example level 5 is set to 40 m, level 6 is 70 m and level 7
is 60 m, then a WASSP information box appears and informs you that a specific power level is invalid
(level 6 in our example). Level 6 can then be set individually to a level below that of level 7 and above
level 5. See Figure 29.
Click
OK
and reset Power Level 6 to a level
between Power Levels 5 and 7.
If no other power levels have been changed,
clicking “
Defaults
” will reset the power level.
Automatic Power
By Signal
Manual Power
Automatic Power
By Depth
Figure 29. Ship Setup Power Tab
►
Absorption Loss
: As sound travels through water, some of the energy contained is absorbed
by the water, resulting in attenuation of the signal. The chosen value of absorption loss is set at
the time of installation, and is used when calculating backscatter. For the WMB-3230 system, a
default value of 40dB/km is used. For the WMB-5230 system, a default of 25dB/km is used. This
value should not be changed without a clear understanding of the absorption properties of the
water in the area you are working in.