Kongsberg Simrad EK80, Installation Manual

Page: 275 / 354

394149/D
273
Making a noise/speed curve to determine vessel noise
The performance of the EK80 will always be limited by different noise sources. During
the Installation Manual, accurate noise measurements are done for different vessel
speeds. The weather and sea conditions for the noise measurements will be those at
the time of the test.
Prerequisites
The EK80 system is turned on and operates normally. All the relevant transceivers have
been set up, and they are operational with their respective transducers.
You need the following equipment:
• Personal computer
• Spreadsheet program
Context
In order to measure the noise, you must record the noise value using the tooltip in the
echogram. Since the noise will vary with each ping, you must make five measurements
for each vessel speed, and then calculate the average noise. You must measure the noise
for each single channel, but you can do all these measurements simultaneously.
Tip
If you record all the raw data during the noise test, you can repeat the test later using
the replay file. You may then use more than five noise samples for each vessel speed
to make a more accurate curve.
Procedure
1 To select Passive mode, use the
Normal Operation
dialog box.
a Open the
Operation
menu.
b Select
Normal Operation
.
c For each transceiver channel, set
Mode
to Passive .
d Select
OK
to save the selected settings and close the dialog box.
Note
If you set
Mode
to Passive, your EK80 will no longer provide any information in
the echogram(s).
2 Enable the
Noise
tooltip.
a Open the
Display
menu.
b Select
Display Options
to open the dialog box.
c Select
Tooltip
to open the page.
d Select
Noise
to enable the tooltip.
Setting to work