SonTek/YSI Argonaut-XR Technical Manual - HydroScientific West

system will change depending on whether
the orientation setting is for up or downlooking
operation.
When installing the compass, the board is
secured using short #4-40 screws (spares are
included in the Argonaut tool kit). Install
fiber washers on both sides of the compass
board for protection. It may be helpful to
stick the washers to the compass board with
a small amount of silicon grease before
installing the compass (the o-ring grease in
the Argonaut tool kit works well). The
compass mounting screws should be
tightened securely, but not over-tightened.
After installing the compass, you need to
specify the system orientation so that the
Argonaut will correctly interpret the
compass data. To specify the orientation for
up-looking operation, establish direct
communication with the Argonaut and send
the following command.
ORIENTATION SET UP
Argonaut Operation Manual Firmware Version 7.9 (May 1, 2001)
SonTek/YSI
After sending the command, send a BREAK to the system. List the hardware configuration
parameters by sending a Show Conf command and verify that orientation is correctly set. The
system is now ready for operation.
Z
Down-looking compass installation
Figure 4 shows the installation of the Argonaut
MD compass/tilt sensor for down-looking operation.
The system is drawn with the transducer
head looking down as if placed on a table. Both
the compass X-axis and the Argonaut X-axis are
coming out of the page (the transducer shown is
beam 1). The compass is installed so that the
component side will be facing up when the
Argonaut transducers are down-looking.
For down-looking operation, four 1” standoffs
are attached to the four 3/8” standoffs installed
on the internal mounting plate (the 3/8” standoffs
are secured with lock-tite and cannot be easily
removed). The positive X-axis of the compass is
aligned with the positive X-axis of the Argonaut
(the compass coordinate system exactly matches
the Argonaut down-looking XYZ coordinate
system). See §6.4 for the definition of the
Y
Z
Compass and
Argonaut
Coordinate
System
2.5"
3/8"
Tilt Sensor
Magnetic Coils
Figure 3 – Argonaut MD
Up-Looking Compass Installation
3/8"
Y
1"
Compass and
Argonaut
Coordinate
2.5"
System Tilt Sensor Magnetic Coils
Figure 4 – Argonaut MD
Down-Looking Compass Installation
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