Ending The Unattended Data Acquisitions; Unattended Profiles Using The Continuous Acquisition Function; Preliminary Configuration; Field Operations - idronaut Ocean Seven 304Plus Operator's Manual

SECTION FOUR – SELF RECORDING

4.2.3. Ending the unattended data acquisitions


Run
the "ITERM" programme.
 Connect the CTD to the personal computer using the USB laboratory cable and then switch ON the
CTD.
 The CTD start-up messages appear.
 Type the <CTRL-C> key until the main menu has appeared again.
 The unattended timed data acquisition cycle is ended and the CTD is working in the default mode,
waiting for the operator's commands.
4.3.

UNATTENDED PROFILES USING THE CONTINUOUS ACQUISITION FUNCTION

This type of acquisition is used to automatically gather and store data at the maximum possible
sampling rate. This data acquisition function can be used to carry out both profiles and timed
acquisitions. The advantage to carry out profiles using the continuous data acquisition, with respect to
the linear (pressure step), is that the continuous data acquisition implies to acquire downward and
upward data.

4.3.1. Preliminary configuration

 Install new batteries or recharge the battery pack (optional NiMH battery pack).
 Run the "ITERM" program.
 Connect the CTD to the personal computer using the USB laboratory cable and then switch ON the
CTD.
 The CTD main menu must appear.
 Check and set up the RTC, if needed.
 Select the "DATA ACQUISITION MENU" and then select the "CONTINUOUS DATA
ACQUISITION".
 Answer the following questions:
Continuous acquisitions
Data acquisition scan rate [125ms]:1 < 125
Data acquisition rate. The parameter is configure in ms. The minimum value is 125 ms and can be
incremented in step of by 125 ms. The below table indicate some configuration examples:
The CTD switches OFF by itself and is ready to perform the data acquisition. Disconnect the USB
laboratory cable and rotate the magnetic rotary switch to the OFF position.

4.3.2. Field operations

Once you have reached the sampling site, switch ON the CTD by positioning the magnetic switch arm
to the red dot; the CTD wakes up and starts to acquire and store data.
When the CTD returns to the surface, switch it OFF by rotating the magnetic switch arm to the OFF
position; data acquisition ends.
Notes:
1) Each time a data acquisition is performed, a new data header is automatically generated.
2) The data acquisition ends whenever: i)The battery has run down. ii) The data memory is full.
iii)The operator decides to stop it.
IDRONAUT – Brugherio (MB)
Sampling rate Interval to set up
8 Hz
6 Hz
4 Hz
2 Hz
1 Hz
0.1 Hz
OCEAN SEVEN 304Plus CTD
125 ms
166 ms
250 ms
500 ms
1000 ms
10000 ms
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12-2015