PNI TCM - Manual (Page 20)

PNI Sensor Corporation DOC#1014688 r06
TCM User Manual – July 2013 Page 15
Before proceeding with a calibration, ensure the TCM is properly installed in the host
system, as discussed in Section 4. Also, the software should be properly configured with
respect to the mounting orientation, Endianness, north reference, etc.
Section 6.4 outlines how to perform a calibration using Studio, while Section 7.3.10 provides
a step-by-step example of how to perform a calibration using the PNI protocol.
5.1.1 Full-Range Calibration
A Full-Range Calibration is appropriate when the TCM can be tilted ±45 ° or more. This
method compensates for hard and soft iron effects in three dimensions, and allows for the
highest accuracy readings. The recommended 12 point calibration pattern is a series of 3
circles of evenly spaced points, as illustrated in Figure 5-1 and listed in Table 5-2. The
pitch used in the second and third circles of the calibration should at least match the
maximum and minimum pitch the device is expected to encounter in use.
Figure 5-1: 12 Point Full-Range Calibration
Note: While Figure 5-1 shows the location of the device changing, this is for illustration purposes and
it is best for the location of the device to remain constant while only the orientation is changed.