M6 System | V4 | Servicing and Maintenance
The acceptable average level of noise depends on the conditions (distance from the sensor to
the hydrophone, fishing method, type of hydrophone). You can have better performance with
the following levels:
• Active wideband hydrophone with high/low gain: below -100 dBV
• Active narrowband: NC-1-04 below -80 dBV / NC-1-07 below -100 dBv
• Passive hydrophone: below -110 dBV
7.
To see the maximum, mean and real time measures of noise level at a specific frequency, select
Marker on the left side of the screen and move the mouse over the graph.
Frequency and levels of noise (dB) at the mouse pointer location are displayed under Marker.
8.
Under Peak, you can check:
•
RealTime: the latest highest level of noise recorded.
•
Max.: the highest level of noise recorded since the beginning of the spectrum.
9.
Check that there is more than 12dBV between the maximum noise level (dark blue line) and the
average noise level (light blue line) on the peak of sensor frequencies.
10.
If you changed the configuration of the hydrophone or sensors, click Reset Max to reset the
dark blue line showing the maximum level of noise.
11.
To save data recorded by the spectrum in a *.txt file, click Save FFT.
The FFT file lists for the entire bandwidth used by the hydrophone (frequencies are in Hz) the
maximum and mean levels of noise since the FFT export has started and the last real time level
of noise before the export (dBV).
12.
If you leave the page, you can access to the spectrum from the bottom of the screen. Right-click
the yellow message to display options.
13.
When you have enough data, click Stop Spectrum.
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