Simrad SC90, Руководство по установке

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356
419050/B
f Select
Test Config
to open the
Test Config
parameter dialog.
g Select
Noise & VR
to select the
Noise test
settings.
h Select the
Horizontal
tab to open the menu.
i Set
Gain
to: 20 – 25
The
Gain
setting has no effect on the noise measurement.
5 Observe the noise on the SC90 presentation.
a Use the
Train left
and
Train right
(arrow) buttons on the Operating Panel to turn
the white audio line (beam) to the most noisy area in the presentation.
b Make sure that the echo level for the selected audio beam is displayed in the
Echo Level
button on the
System Test
menu.
c Adjust the
Gain
until the echoes on the images on the SC90 presentation are
dynamic, and you can distinguish between the individual echoes.
6 Read the current echo level displayed by the
Echo Level
"button".
a Change the
Frequency
to the next available setting.
b Repeat this for each frequency that is shown in the result table.
c Fill in the test results in the table provided.
Result
Requirements Results
Maximum noise value (in dB) shown in the
Echo Level
button is ≤50 dB.
Maximum noise value measured in the
Echo Level
button is:
Date and signature:
For each transmit frequency (in kHz), write down the measured noise level (in dB).
82.5 83 83.5 84 84.5 85
Further requirements
If the noise level is higher than specified, you must check the reason(s) for this.
• Check the grounding of the Transceiver Unit.
• Verify that other electric equipment and/or machinery on board, such as cooling
systems, hydraulic pumps, electric motors etc, do not influence on the noise reading.
Switch off as much machinery as possible, especially electrical motors.
• Check for interference from other hydroacoustic systems.
• Check for environmental noise, such as other vessels in the vicinity or animal life.
Simrad SC90 Installation Manual