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Noise seen
as a constant
torch beam
which moves
with vessel
motion. Noise
could fade
in and out
down this line
depending on
the frequency.
Doc. P/N:
WSP-009-002
Version:
V2.3
Issue Date:
July 2014
Installation Manual
Commissioning Step 5: Electrical Noise
1)
Open a Sonar display as a full screen display.
2)
Enable manual range control on the Range Control Knob and change the
range dial to 90 m.
3)
Change the gain to 30 on the Gain Control Knob.
4)
Right Click on the Sonar Display and ensure Normalise Display is not
selected.
5)
Use the Advanced Options to set the Clutter to zero and Disable both the
Aeration and Interference filters as these may hide any noise signals.
6)
Double click to ensure all 90 metres are displayed on the sonar display.
7)
If possible do this test at rest with the engine out of gear and with all other
sounding devices off.
Check the centre line of the Sonar display for a consistent signal or a consistent
pulse down a radial line. If present this is evidence of noise signals common to
all channels. If this noise can be clearly seen as more than a faint blue-white
vertical line on the display, it is likely that all of the receiver channels are picking
up electrical noise. If the display is relatively clean move to the next test. The most
likely cause of noise problems is incorrect termination of the transducer cable
grounding and screening. Ensure a low gauge grounding wire is attached to a
solid ground which is common to the power supply ground.
Figure 31: System with Significant Electrical Noise
www.wassp.com
Gain
Control
Knob
Range
Control
Knob
Page 49 of 68
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