Geometrics Inc. G-882 Cesium Marine Magnetometer Page
4.5.5 Depth Calibration Using MagLog-Lite or MagLog
MagLog logging software from Geometrics provides capability to perform
calibration of the depth sensor. It is preformed very much like the methods
described above. Refer to the excerpt from the MagLog-Lite/ MagLog
NTmanual below.
Depth/Analog channel calibration
In order to get an accurate depth sensor reading, the pressure transducer
sensor must be calibrated. This means that the depth sensor reading needs to
be compared with a known depth to account for the variations occurring due to
air pressure variations and to manufacturing variances. Bias and linearity
adjustment can be made in the program to empirically calibrate for depth. (You
can read more about this method at the end of the section).
The depth reading from the magnetometer is an integer between 0 and 9999.
This represents the full-scale range of the depth transducer. There may also
be a certain offset that must be adjusted.
MagLog™ offers a few ways of calibrating the depth.
Note: These methods also work for calibrating other analog channels
Calibration Procedure:
The basic procedure for calibrating the depth sensor is as follows:
1) Place magnetometer in the water for at least 15 minutes at a known
depth, say 3 meters. This will give the temperature of the sensor
time to stabilize.
2) Write down the depth and reading that MagLog™ gives you.
3) Place magnetometer in the water at a DIFFERENT depth.
4) Write down the depth and reading that MagLog™ gives you.
5) Use either automatic calibration feature or manual calibration to apply
results.
Note: If you use automatic depth/analog channel calibration, you can do this
while in the calibration screen.
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