User`s manual

Section 2: Installation and Use
9
• Display Windows - SEASAVE can display up to ten windows. The
windows can be set up to display real-time data (conductivity,
temperature, pressure, etc.) as well as calculated parameters such as
salinity and sound velocity. The three windows types - fixed, scrolled, and
overlay (plot) - are briefly described below; their setup is described in
detail in Section 6: ScreenDisplay Menu - Setting Up SEASAVE Displays.
! The Fixed Display window has a vertical list of the selected
parameters to the left, and displays their current values to the right.
! The Scrolled Display window has a list of the selected parameters
across the top, and displays the data in scrolling vertical columns
! The Overlay (plot) Display window plots one parameter on the
y-axis and up to four parameters on the x-axis.
Notes:
• The algorithms used to calculate
derived parameters in SEASAVE are
the same as used in SBE Data
Processing’s Derive and Data
Conversion modules (with the
exception of the oxygen calculation).
See the SBE Data Processing manual
on our website or the SBE Data
Processing Help files for details.
• Oxygen computed by SEASAVE and
SBE Data Processing’s Data
Conversion module is somewhat
different from values computed by
SBE Data Processing’s Derive
module, because the algorithm uses
the derivative of the oxygen signal with
respect to time. SEASAVE and Data
Conversion compute the derivative
looking backward in time, since they
share common code and SEASAVE
cannot use future values of oxygen
while acquiring data in real time.
Derive uses a centered window (equal
number of points before and after the
scan) to obtain a better estimate of the
derivative. Use SEASAVE (or Data
Conversion) to obtain a quick look at
oxygen values; use Derive to obtain
the most accurate values
• If your data includes underwater and
surface PAR data, you can select
Corrected Irradiance [CPAR] as an
output variable. SEASAVE calculates:
CPAR = (100 * ratio multiplier *
underwater PAR) / surface PAR
where
ratio multiplier = scaling factor used for
comparing light fields of disparate intensity;
input in .con file entry for surface PAR
sensor
underwater PAR = underwater PAR data
surface PAR = surface PAR data
For complete description of ratio
multiplier, see Application Note 11S
(11plus Deck Unit) or 47 (SBE 33 or
36 Deck Unit).