Marport Scala2, User Manual

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Scala2 | Version 5 | Maintenance and Troubleshooting
Checking Noise Interference
Use the spectrum analyzer to check the noise level of the hydrophones and check for interference.
Procedure
1. Click Add to create a new page on which you will add the spectrum analyzer(s).
2. Right-click the IP address of the receiver in the status bar and click Start Spectrum .
3. Open the control panels and go to the Mx panel.
4. Go to Hydrophone data, then drag and drop Spectrum data to a page. These data appear only
when the spectrum has been started.
5. The spectrum analyzer is displayed. You can display up to 6 spectrum analyzers at the same
time. Below is an example of a page with two spectrum analyzers.
The FFT plot shows three levels of noise in dBV:
1. RealTime (white): level of noise recorded in real time.
2. Mean (cyan): mean recorded level of noise. It is useful to assess the noise floor.
3. Max (dark blue): shows the latest highest level of noise recorded. It is useful to see on which
frequencies are the sensors.
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:
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