Estimating The Efficiency Of Hydrophones - Marport PRO M6 Service Manual

8. Check that there is more than 12 dBV between the maximum noise level
(dark blue line) and the average noise level (cyan line) on the peak of sensor
frequencies.
9. If you changed the configuration of the hydrophone or sensors, right-click the
graph and click Reset Max to reset the dark blue line showing the maximum level
of noise.
10. To check the maximum, mean and real time measures of noise level at specific
frequencies:
a. Right-click the FFT plot and click FFT Marker.
b. Click and drag the marker at a specific point.
Frequency and levels of noise at the marker position are displayed on the
right side of the graph.
11. Right-click the spectrum and click Pause if needed.
12. To save data recorded by the spectrum in a *.txt file, right-click the FFT plot and
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).
13. Right-click the spectrum analyzer and click Hide FFT to hide the FFT plot.
14. Right-click the IP address of the receiver in the status bar and click Stop
Spectrum.

Estimating the Efficiency of Hydrophones

You can use the page Messages to check the efficiency of the hydrophones.
To see incoming messages, click Menu
and click Messages.
> Expert Mode . Click the menu icon again
M6 PRO | V7 | Maintenance and Troubleshooting
101