Sequoia LISST-200X - Data Quality Control

LISST-200X User’s Manual LISST-200X Operation Details Page 64
11. Data Quality Control
Making sure your data make sense.
STEP
ACTION
RESULT
1
• Follow steps 1-6 in the previous section: View
Processed Data File and look at the Auxiliary
Parameter Frame
Data file loaded and
Auxiliary Parameter
frame shown.
2
3
• The first thing to look for is to make sure that the
Laser Reference box is displaying numbers different
than 0.
• In the example above Laser Reference is at 8.943
mW, but this number can vary from instrument to
instrument, and will also vary as the instrument
becomes older and, to some extent, with
temperature. Values around 0.5-2 mW are the most
common values.
• Laser Reference should never be 0 (or very close to
0, e.g. 0.02 mW). If this is the case the laser is most
likely dead. In this case only your pressure data and
temperature data will be any good. The laser must
be replaced. Contact Sequoia or your local
distributor for instructions on what to do.
• Tip: If you selected ‘Create .CSV file’ when
processing your data, you can load the .CSV file
into Excel or another spreadsheet and easily check
all the Laser Reference values - the Laser
Reference value is in column number 40.
Check your Laser
Reference values –
they *MUST* be >>
than 0.