Teledyne Oceanscience rapidCAST, Руководство пользователя

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rapidCAST User’s Guide March 2018
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 51
An Offset parameter allows a user to add a positive or negative distance to the Nominal Target Depth to
“tweak” the depth that is ultimately fed to the dive table, so that the actual achieved depth agrees more
closely with the intended target. For example, if the Nominal Target Depth is 30 meters, and it is discov-
ered that the current dive table is achieving an actual probe depth of 28 meters, an Offset of 2 meters can
be entered to make the probe fall deeper. Conversely, if the Nominal Target Depth is again 30 meters, but
the actual depth overshoots the target and is 31.5 meters, a negative offset of -1.5 meters can be entered to
adjust the depth shallower. The Offset parameter is additive: positive offsets will make the probe fall
deeper, negative offsets will make it fall shallower.
RapidCAST Interface 1.5.1 introduces a multiplier factor called Coverage. Coverage is a positive-valued
parameter that can adjust Nominal Target Depth from 0% thru +100% to give the user increased flexibil-
ity in specifying a correction factor. In the context of depth correction, these fields take on the following
meaning:
Nominal Target Depth: The depth which the user truly wants to achieve with the probe; the actual
goal.
Adjusted Target Depth: The corrected depth that is passed to the dive table in order to achieve the
Nominal Target Depth. This is the “tweaked” depth that is feed the dive table in order to coerce it into
achieving the nominal depth, in reality.
Nominal Target Depth * (Percent Coverage / 100) + Offset = Adjusted Target Depth
If no adjustments are necessary, Coverage should be 100% and Offset should be 0 meters, in which case
the dive table will receive the Nominal Target Depth as-is.
Beyond acting merely as a corrective multiplier, an alternate interpretation for Coverage can
be found in the context of Auto-Depth: Assuming an accurate dive table, now that a depth
sounder can measure the depth to the seafloor and can set the Nominal Target Depth to this
value automatically; the user can specify percent coverage of this depth. For example, if the
user wants the probe to cover 90% of the water column, Percent Coverage can be set to
90%.
Using Auto-Repeat
After the deployment sequence has been started by the user, hands-free automation comes in the form of
the Auto-Repeat checkbox being checked. If Auto-Repeat is enabled, the deployment sequence will
automatically repeat at the conclusion of each cast. A user-selectable wait period can be specified via the
final Hold Position task to give the probe time to download its data before being deployed again and/or to
control the frequency of automated casts. If Auto-Repeat is not checked, the winch remains stationary
until the user starts the next cast.