Derived Parameters - RBR duo3 C.T uv Manual

5 Derived parameters

Calculate derive parameters using Ruskin software or on the RBR instrument itself, depending on how it is configured.
Both routes use the same equations and produce identical results.
Calculation on Ruskin
All derived parameters will be calculated on Ruskin:
when the data storage format is set to Desktop and Realtime is set to None
•
As a result, the RSK file will only store raw data. This option enables post-processing on Ruskin, with the flexibility of
changing the variables.
To obtain derived parameters, download the dataset to your laptop and open it on Ruskin, then
Parameters tab. Furthermore, Ruskin has alternative derivation options for some parameters,
parameters into the
which you can also select in the Parameters tab. See
The Desktop storage format is a preferred option. Having the raw data keeps more options open in the long

term.
However, when you are managing your deployments using a smartphone, it is more efficient to derive
parameters in realtime than post-process a large RSK file with raw data, due to limited capabilities of mobile
devices.
Calculation on the instrument
All derived parameters will be calculated on the instrument:
• when the data storage format is set to Mobile
or
when the data storage format is set to Desktop and Realtime is set to Serial or USB
•
As a result, the RSK file will store the data with calibration coefficients already applied and derived parameters already
calculated.
CT measurements allow for deriving salinity, specific conductivity, speed of sound, and density anomaly.
CTD measurements allow for deriving salinity, specific conductivity, speed of sound, density anomaly, sea pressure, and
depth.
RBR#0015699revB
Ruskin User Guide: Standard Instruments
input physical
3
for details.
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