Setting up the sound velocity probe interface
The sound speed close to the transducer face is an important parameter for maximum accuracy. You can retrieve the information from a dedicated speed velocity probe.
Prerequisites
ME70 must be connected to the sound velocity probe using a serial line according to specifications.
Make sure that the total length of the serial line cable does not exceed approximately 50 meters. If a longer cable is required, you may need to use buffer amplifiers.
A port must be selected for receiving information from the sound velocity probe, and communication parameters must be defined.
Context
Many users mount a sensor close to the transducer face in order to measure the sound speed. The sensor is often referred to as a sound velocity probe.
Communication with the sound velocity probe is based on proprietary datagrams. The following datagrams are supported:
•  AML CALC
•  Sippican SVP
Note
The sensor is not a part of the ME70 system. This is a commercial item that can be purchased locally.
Procedure
1 Open the Setup menu.
2 Select Environment.
Image
Observe that the Environment dialog box opens.
3 Open the Transducer Face page.
4 Select Probe if you have a suitable sensor connected to your ME70.
By selecting Probe, the sound speed values from the sensor are received. The information is included in the raw data files.
5 Select Profile to set the sound speed at the transducer to the speed value from the profile at the transducer depth.
a Go to the Profile page to select the profile to be used.
b Return to the Transducer Face page.
6 Set the warning limit for difference in sound speed between profile and probe.
If the difference exceeds the value you have defined in the spin box, an alarm is generated. The purpose of this alarm is to notify you that you should load a new profile.
7 Select OK to save the selected settings and close the dialog box.