The magnetic sensors in the TCM are calibrated at PNI’s factory in a magnetically controlled environment. However sources of magnetic distortion positioned near the TCM in the user’s system will distort Earth’s magnetic field and should be compensated for in the host system with a user calibration. Examples of such sources include ferrous metals and alloys (ex. iron, nickel, steel, etc.), batteries, audio speakers, current-carrying wires, and electric motors. Compensation is accomplished by mounting the TCM in the host system and performing a user calibration. It is expected the sources of magnetic distortion remain fixed relative to the TCM’s position within the host system. By performing a calibration, the TCM identifies the local sources of magnetic distortion and negates their effects from the overall reading to provide an accurate heading.
- Requires incorporating the compass into the host system to compensate for magnetic sourcing and distorting components with the user’s system.
- Allows for 4 different methods of calibration. Full-Range Calibration provides the highest heading accuracy, while 2D and Limited-Tilt Calibration support a limited range of motion during calibration. Hard-Iron-Only Calibration updates just the hard-iron coefficients with a relatively easy procedure.