PNI TCM 5 - Manual (Page 19)

PNI Sensor Corporation Doc #1007537 r12
TCM3 & TCM5 User Manual – Sept 2012 Page 19
Default:
This button will set the TCM Studio program back to the factory default settings.
Revert:
This button will have the TCM Studio program read the settings from the unit and display them on the
screen.
4.1.4 Calibration Tab
Note: The default settings of the unit are recommended for the highest accuracy and
quality of calibration.
Samples:
1. Click on the <Start> button to begin.
2. To take a sample point, the unit will need to be held steady for a short time. Once the window in-
dicates the next number, the unit can be moved some distance and held steady for the next sam-
ple. A minimum change of 30 degrees in heading or tilt is required for a sample to be taken. The
larger the distance between points the better. The amount of Pitch and Roll during the calibration
will determine the amount of Pitch and Roll the unit will be able to compensate for during use.
Once the pre-set number of samples has been taken the calibration is complete.
Note: The minimum points the unit can use for a successful calibration is 12. The unit will
need to be rotated through at least 180 degrees in the horizontal plane with minimum of at
least 1 positive and 1 negative Pitch and Roll as part of the 12 points.
Results:
1. Once the calibration is complete the “Coverage” window will indicate the quality of the calibration.
The X, Y, and Z values show a percentage of each vector that has been covered during the cali-
bration. The only way to get a Z value greater than 50% would be to take some points with the
unit upside-down. The value shown in µT refers to the standard deviation of the measured sam-
ples when compared to the calculated values. The smaller the number the better. If a better
score is needed, click on the <Start> button to begin a new calibration.
Note: The value in µT only refers to the quality of the calibration and NOT the accuracy of
the heading. It is possible to have a “good” calibration but poor accuracy if the field the unit
is exposed to during use is not the same as that which was present during the calibration.
2. If the calibration is sufficient then click on the <Save> button to save the calibration. If this button
is not selected then the unit will need to be recalibrated after a power cycle.