36
LISST-100X User’s Guide
4
If there is a problem with the instrument or if the
water or windows are not clean, error messages
will be displayed. Dirty water or windows will
generally cause higher values across the middle
rings. Large bubbles or particles in the water
can cause higher values on the inner rings or
left hand side of the display. High values on the
inner rings combined with a lower Laser power
value can also be an indication of optical
misalignment.
5
If you see elevated values on
some
of the 8
inner rings, save the background and do the
following: Open the factory_zsc_SNSN.asc file
for your instrument, where SNSN is the
instrument serial number. It can be opened in
Notepad or a similar text editor.
Check for misalignment if
some
of the inner 6 rings
are high
6
Note down the 33
rd
and the 36
th
value; they
should be around 1000-1500 for most LISST-
100X’s:
Element 33 (factory) =
Element 36 (factory) =
Elements 33 and 36 from
the factory_zsc_SNSN file
recorded
7
Now divide element 33 with element 36:
Element 33 / Element 36 =
This is the
factory laser ratio
Factory laser power divided
by factory laser reference
8
Open the background file you just saved and
write down the 33
rd
and 36
th
value:
Element 33 (new background) =
Element 36 (new background) =
9
Now divide element 33 with element 36:
Element 33 / Element 36 =
This is the
zscat laser ratio
Zscat laser power divided
by zscat laser reference
10
Divide zscat laser ratio with factory laser ratio
Is this value < 0.85? If so, your instrument may
be misaligned
11
Do you see elevated values on ALL of the 4-8
inner rings?
Most likely bubbles, as misalignment cannot
increase the ring value on rings 1-4 at the same
time.
Check for bubbles?
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