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Reading Units:
Compass:
Use to select either Degrees or Mils as the unit of measure.
Inclinometer:
Use to select either Degrees or Mils as the unit of measure.
Temperature:
Use to select either Celsius or Fahrenheit as the unit of measure.
Default:
This button will set the TCM2.5/2.6 module back to the factory default settings for the parameters
shown on the screen.
Note:
This is similar, but with less parameters, to the
factory
command.
[Calibration Tab
]
Start (stop)
Toggle button to begin and end calibration
Calibration Procedure:
1. Click on the
<Start>
button to begin.
2. Begin rotating the TCM2.5/2.6 in a circle while applying pitch and roll to the unit. The unit will
have the appearance of a “wobbling top” as it is moved through the calibration routine.
3. Turn the TCM2.5/2.6 around at least twice changing the pitch and roll as much as possible.
4. Each turn should take longer than 30 seconds. The turn does not need to be a perfect circle. In
the calibration mode, the TCM2.5/2.6 is trying to take as many different data points as possible to
determine the magnetic anomalies. The more pitch and roll points you give it, the better it is able
to determine the vertical magnetic fields. If possible, apply as close to a ± 90
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roll. Doing so will improve the quality of the calibration. Do not worry about exceeding the tilt
range of the unit.
5. Once two complete rotations have been completed, click on the
<Stop>
button to finish the
calibration.
Score
The TCM2.5/2.6 provides feedback on calibration through the calibration score, which has the
following format: “...HnVnMn.n....”
The first two numbers in the calibration score, HnVn, respectively describe the quality of the
calibration for the horizontal component and vertical component of the host system’s local magnetic
field. Higher numbers reflect higher quality. The highest possible score is a “9”. The factors that
contribute to a good score for Hn and Vn are as follows:
a good, magnetically quiet location was chosen for the user calibration procedure.
the magnetic environment is stable; there are no large sources of changing fields.
the calibration data points included changes in system heading and inclination to
allow for proper measurement of the horizontal and vertical field vectors.
there are no significant soft-iron distortion effects.
