3.15 CONTINUOUS DATA ACQUISITION
The continuous data acquisition is a very simple and straightforward acquisition method. After the
cycle configuration, all the times the probe is switched on, it starts to acquire, show and store in memory
the acquired data according to the configured sampling rate (0.1 Hz to 28 Hz). An indefinite number of
measurements can be performed for each cycle. An indefinite number of cycles can be performed by
switching ON and OFF the probe.
Continuous data acquisition setup
Data acquisition scan rate [50ms]:50 enter new value< 250
The operator can select a sampling rate between 0.1 and 28 Hz by configuring the associated time among
the samplings expressed in ms, the most common are:
Sampling rate Interval to configure
28 Hz 35 ms
20 Hz 50 ms
10 Hz 100 ms
5 Hz 200 ms
1 Hz 1000 ms
0.1 Hz 10000 ms
After the data acquisition rate has been entered the probe is ready to start the continuous data
acquisition cycle, and the following message appears on the PC screen:
Configuration updating. Done
----- UNATTENDED Continuous Acquisitions -------
To start the measuring cycle, switch OFF the probe now and then switch it ON when ready
To stop while the probe is ON, type <ESC> until a message appears
Between acquisition cycles, while the probe is on surface, wait 1 minute before switching OFF the probe
Wait at least 30 seconds before executing a new start-up
Now, the operator must switch off the probe using the magnetic switch on the probe top cover. The
probe will be switched on again to start the first continuous data acquisition cycle when the operator is
ready to deploy the probe in the field.
Once switched on, the probe starts to acquire, show and store data in memory until one of the terminate
conditions is met.
3.15.1 Step-by-step procedure
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 Probe->Set Time setup the probe date and time
4. If the Main Menu does not appear, type <VT> followed by a <CTRL-J>. The Main Menu appears. 5
From the Main Menu, select the "Data Acquisition sub-menu" through the DATA command.
5. from the "Data sub-menu", select the "Continuous Data acquisitions" by means of the DACO
command.
6. The first question concerns the data acquisition interval.
7. The probe switch off by itself
8. Switch OFF the probe using the top cover 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 starts the acquisition using the configured step. Lowering the probe in water starts the data
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