it reaches the lower operating limits, the unattended profile immediately ends and the probe
switches OFF by itself. No other profiles will be accomplished. It is therefore important to verify
the battery conditions before starting a series of profiles.
❖ Each unattended linear profile is stored in a different cast.
3.12.2 Terminate the unattended linear profile
To terminate the unattended linear profile, connect the probe to a PC and then switch the probe ON. It
will try to start an unattended linear profile again. When the probe shows the acquired data waiting for
pressure increment, type the <ESC> key and answer <YES> to the following answer:
Do you want to terminate the unattended linear profile Yes, No
The probe will terminate the current acquisition and returns to the Data Acquisition Menu.
3.12.3 Step-by-step Linear Profile procedure
This paragraph describes a step-by-step procedure to perform an unattended linear profile. After
establishing a valid connection with the probe using the "Verbose operating mode", proceed as follows:
A) Preliminary configuration
1. Run the “ITERM” programme.
2. Switch ON the probe.
3. Using the ITERM function PROBE -> SET TIME setup the probe RTC
4. If the Main Menu does not appear, type <VT> followed by a <CTRL-J>. The Main Menu must
appear.
5. From the Main Menu, select the “Calibration sub-menu” by means of the CALB command.
6. From the Calibration Sub-menu, select the sensor calibration by means of the CASE command.
7. From the list of sensors, select the Pressure transducer and then follow the on-screen instructions.
8. At the end of the pressure sensor calibration, perform any other sensor calibration procedure you
judge indispensable.
9. At the end of sensor calibration type the <ESC> key twice and you will return to the Main Menu.
10. From the Main Menu, select the "Data Acquisition sub-menu" through the DATA command.
11. From the "Data sub-menu", select the "Linear profile" by means of the DALD command.
12. The first question concerns the pressure step in dbar to use during the data acquisition.
13. The second question concerns the number of data sets to acquire for each sampling point. You
can decide to acquire more than one data set for each sampling depth.
14. The last question concerns the confirmation of the above parameters. Answer YES.
15. Now, the probe switches OFF by itself and is ready to perform the data acquisition.
16. Switch the probe OFF by means of the magnetic switch.
B) Field operations
1. Once you have reached the sampling site, switch ON the probe by means of the magnetic switch;
the probe watches the pressure sensor value to start the acquisition. Lowering the probe in water
starts the data acquisition and data storing. Before starting the profile we suggest immersing in
water the probe and, wait at least 30s to stabilize the sensors.
2. When the probe returns to the surface, switch it OFF by means of the magnetic switch; data
acquisition ends immediately. The probe is ready to carry out a new profile.
The above operations can be executed repeatedly until the probe batteries have run down or until the
probe memory is full of data. Each time a data acquisition is performed, a new data header is
automatically generated.
C) Ending the unattended data acquisitions
1. Run the “ITERM” programme.
2. Switch the probe ON by means of the magnetic switch.
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