2
You can now start the LISST-ABS software to see the values in real time. You
can also use the software to log data. Below is a screen shot of the software
while data is being logged to text file. More details on the operation of the
software can be found in Section 2.5.
The Cal Factor is a calibration value that is used to convert Uncalibrated
Concentration (C
u
) to Concentration in mg/L. The LISST-ABS is calibrated and
adjusted at the factory using 75 to 90 micron particles so that the Cal Factor
for
these particles will always be 1. You may use this value for a quick
approximation of concentration, but the most accurate results require your own
calibration, as described in Appendix B.
The LISST-ABS generates a new measurement every second. If you wish, you
can reduce sample-to-sample variability by averaging. Type the desired number
of measurements to average in the box below the plot. If you enter 5, for
example, each point on the plot will show the average of 5 samples, and the
update rate will slow to one point every 5 seconds.
To save measurements to a text file press the
‘Start Logging’ button You will be
asked to select a location and name for the file. Data will be saved to the file
until
‘Stop Logging’ is pressed. The log file contains a header with the Cal
Factor value, time zone, and the instrument serial number. Following the
header are three columns of data: date, time, and measured concentration
(mg/L). The Log file is a space delimited ASCII file that can be easily imported
into programs such as Excel.
Detailed instructions on connecting the LISST-ABS to your datalogger are
covered in separate sections of this manual. For SDI-12 operations see Section
2.2. For Serial/RS232 operations see Section 2.3. For Analog Output
operations see Section 2.4.
Содержание LISST-ABS
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