419050/B
355
Measuring the Echo level in
Passive
mode
Low noise is a key factor for high quality and reliable measurements. The performance
of the SC90 will always be limited by different noise sources. A high noise level will
mask the echoes and make them difficult to read and interpret. The noise is measured
while the SC90 operates in
Passive
mode with the transmit pulses disabled.
Prerequisites
The SC90 is installed as specified in this manual. The vessel is at sea. The SC90 is
turned on, and it is working normally. Neither tools nor instruments are required. In
order to do this test, the ship must be "silent".
• The water must be as deep as possible. Recommended minimum depth is 100 metres.
• There must be no other vessels in the vicinity.
• The vessel must lie still in the water.
• As much machinery as possible must be switched off. It is particularly important to
switch off electrical motors, as well as cooling systems and hydraulic pumps that
may cause electric noise.
• To prevent interference, all other hydroacoustic instruments must be switched off.
This test must be considered as indicative. With the vessel in port, the environmental
conditions are not satisfactory. In the shallow waters of the port, noise from other
vessels, dockyard workers or machinery will cause unreliable test results. If you do
this tests in a busy harbour, or with noise sources present, the sensitive receivers will
detect all the noise in the nearby waters.
Context
This task allows you to check the noise conditions. To measure the noise level, observe
the value presented by the
Echo Level
button in the
System Test
menu.
Procedure
1
Make sure that the transducer is retracted to its upper position.
2
Set
Mode
to
Bow Up
.
3
Set
TX Power
to
Off
.
4
Make the following preparations.
a
Select the
Horizontal
tab to open the menu.
b
Set
Range
to: 1200 m
c
Set the
Frequency
to: 82.5 kHz
d
Select the
Setup
tab to open the menu.
e
Select
Test
on the
Setup
menu to open the
System Test
menu.
Summary of Contents for SC90
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Page 223: ...419050 B 221 Øverland UPC 5000P Dimensions Cable layout and interconnections ...
Page 438: ...436 419050 B 427177 Transducer dock dimensions page 494 Simrad SC90 Installation Manual ...
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Page 477: ...419050 B 475 083045 Gate valve installation DN500 Drawing file ...
Page 479: ...419050 B 477 33414 Gate valve dimensions DN350 Drawing file ...
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Page 481: ...419050 B 479 Related topics Installing the optional gate valve DN350 page 84 Drawing file ...
Page 482: ...480 419050 B 33473 Gate valve dimensions DN350 Simrad SC90 Installation Manual ...
Page 483: ...419050 B 481 Related topics Installing the optional gate valve DN350 page 84 Drawing file ...
Page 484: ...482 419050 B 33498 Gate valve dimensions DN500 Simrad SC90 Installation Manual ...
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Page 487: ...419050 B 485 37357 Gate valve dimensions DN500 Drawing file ...
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Page 489: ...419050 B 487 Related topics Installing the optional gate valve DN500 page 103 Drawing file ...
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Page 495: ...419050 B 493 Related topics Installing the optional gate valve DN350 page 84 Drawing file ...
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