Xylem 6-Series Multiparameter - Manual (Page 160)

650 MDS Section 3
YSI Environmental Monitoring Systems Operations Manual 3-30
The user places the sonde in the water and watches the readings on the 650 display until they are stable.
When stable, the Log one sample selection in the Sonde logging window (upper right) is highlighted as
shown above and the Enter key is pressed. The header changes from “Run” to “Sample logged” to confirm
that the data storage to sonde memory was successful and then returns automatically to the Sonde run
display. The user turns the 650 off and returns to the office to retrieve the data.
The single data point is stored in the sonde memory under the automatically generated file name NONAME1.
The file can be viewed by selecting Sonde menu from the 650 Main menu and pressing Enter.
To view the data on return from the site, the user selects the sonde menu File selection, presses Enter to
confirm the entry, and then highlights theView file selection and presses Enter. Following these instructions
generates a display of the data that is stored in the sonde memory under the default name NONAME1. Use
the right/left arrow keys to scroll horizontally to view all of the data.
The user manually records the data from the site and turns the system off.
3.5.2.3 EXAMPLE 2 – CONTINUOUS LOGGING APPLICATION TO SONDE
MEMORY
A user wants to carry out a vertical profile of a lake from 0 to 30 feet in order to detect the presence of a
thermocline, and, if identified, to locate its position in the water column. The experiment will involve
lowering a 6920 sonde in 1 foot increments until the bottom of the lake is detected, leaving the sonde at each
depth for 3 minutes to allow the sensor readings to stabilize while logging data continuously. Thus, the user
will generate data over a 90 minute time period (30 increments times 3 minutes per increment). If data were
logged directly to sonde memory at the default 0.5 second sample interval, a very large data file containing
5400 data points would be generated, with little benefit gained from its size.
With this in mind, the user decides to increase the sample interval to 16 seconds, thus greatly reducing the
amount of data in the file with no loss of real resolution. As explained above, the sample interval for logging
to sonde memory is set in the Discrete sample menu of the sonde, and thus the user MUST activate the 650
Run display indirectly using the 650 Sonde menu selection as detailed above.