User manual

Table Of Contents
order in which the measurements appear in the scan. Translating the tilt, compass, and path
velocity measurements into velocities in a Cartesian earth frame will be described during the
discussion of Data Offload, Processing, and Interpretation.
-Y(4)
+Y(2)
-X(3)
+X(1)
Left View
Flow Field
Top View
Figure G-29: ACM Scan Velocities
Note that it is necessary to store the four path velocities and the compass and tilt
information, not a Cartesian earth or MMP frame velocity vector. The contribution of profiler
motion to the velocity measured by the ACM cannot be removed from such a vector during post-
processing, so the ability of the ACM to perform the calculation should not be used. The ocean
velocity field through which the MMP moves can only be mapped if all nine ACM measurements
and an independent measure of profiling speed are available. The CTD provides that last piece of
information in the form of the pressure rate, the change of depth with time.
Option <6> ACM Tilt and Compass
This option provides a scrolling display of ACM tilt and compass information. The
scrolling display provides the operator with a hands free data steam during a spin test.
NOTE (Firmware Version 2.07)
If you are operating a firmware version prior to 2.08, upgrade before using this option. Versions
prior to 2.08 shut down the ACM in run mode, which is not optimal.
G-23