Geometrics Inc. G-882 Cesium Marine Magnetometer Page
logging computer. A 6 foot cable is supplied but an RS-232 extension cable of
up to 40 or 50 feet could be used.
While reading this section, refer to the System Connection Diagram in
Appendix B.
The Junction Box functions as the connection point for power and signals
required for a functioning G−882 magnetometer system. The Data Logging
computer, Junction Box and the power source should be installed in a protected
environment. These items are susceptible to water damage and most likely will
cease to function if they become wet, particularly with salt water from a sea
wave. Their installation could be in the cabin of the boat or the equipment room
if there is one. In a very small boat, provide some protection by elevating this
equipment from the deck and covering it with a tarp or provide a waterproof
enclosure.
4.6.3 Deployment of the G−882 Magnetometer
Turn the power on the DC/Data Junction Box and the Logging Computer. After
five minutes warm up for the magnetometer and boot up of the Logging
Computer, start the logging software as described in the Quick Start Software
Guide or the MagLog manual. If you have not previously used the Survey
Wizard to set up a survey, do so now. If you have previously created a survey,
use the “Start New Survey” from the File menu and then select “Same
Hardware as Last Survey” to set the configuration.
If the magnetometer is positioned horizontally on the deck away from any steel
objects, you may begin to see readings that represent the intensity of the
earth’s field in the survey area. If you are on a steel hulled vessel, you may not
see quiet data until you launch the magnetometer fish and it is about 30m
(100ft) behind the vessel. With the system running you can proceed to perform
the calibration of the depth sensor as described in Section 4.5.4 of this manual.
If the logging software is operating at power-on time, the following outlines what
might be observed as the magnetometer is powered-on and warms up to
operating temperature. If the numbers observed are somewhat outside the
ranges given below, the magnetometer is still in most situations,
operating properly. Extreme temperature conditions may cause some of
these values to go significantly outside these ranges during normal operation.
1. Just after power-on and before the counter begins normal operation
some erroneous data may be observed for a brief period of time.
2. When the counter begins normal operation the following may be
observed as the magnetometer begins to warm up:
To Next Page
Loading...
Need help?
General