Sequoia LISST-200X, Руководство пользователя

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LISST-
200X User’s Manual
29 LISST-200X Operation Details
3.
Saving and Evaluating Clean Water Backgrounds
In order to properly compute the size distribution, it is necessary to remove the light
scattering from the internal optics and window surfaces so that only the light scattering from
the particles of interest are used to compute the size distribution.
STEP ACTION RESULT
1
•
Connect the instrument to the computer and establish
communication in the LISST-200X program (page 28)
Software open,
communicating with
LISST-200X.
2
•
Clean instrument and install Clean Water Background
Test chamber.
•
Fill with clean filtered water and make sure no bubbles
are in the water or on the windows.
•
The water and instrument should be at the same
temperature. Using water a significantly different
temperature from the water can impact the quality of
the background.
•
Stir the water well before obtaining a background to
make sure the water is well mixed.
•
For the best Background, make sure the instrument is
clean; the water you use is filtered, and free of
bubbles. Temperature fluctuations in water will
seriously degrade the background. Use water at the
same temperature as the instrument. Stir well.
Optics submerged in
water
3
•
Select Collect/View Background from the software
home page. The factory background file will be
automatically acquired from the instrument and
displayed on the screen.
•
The current signal from the 36 ring detectors will also
be displayed in real time.
•
When the Collect New Background button is pressed
20 samples will be collected and the average
displayed to the screen.
Background collected
and displayed on the
screen