
Where GPS is compromised or unavailable — whether underwater or underground, beneath a bridge or inside a building — PNI's FieldForce® TCM tilt-compensated compass modules provide reliable, pinpoint-accurate pitch, roll and compass heading. The TCMs use advanced algorithms to counter the effects of hard and soft iron interference, providing highly accurate heading information in most any environment and any orientation. PNI's patented magneto-inductive sensors and pioneering measurement technology combine to provide all this performance under a low power budget that extends mission duration. The TCMs' unmatched performance in real-world conditions makes it ideal for applications that require consistency and accuracy in the field — dead-reckoning navigation, far target location, AUV and ROV navigation, object tracking, and more.
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2-axis measurement | High Resolution / Accuracy | ||||
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3-axis measurement | Low power | ||||
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3D orientation | Module | ||||
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Hard- and soft- iron correction |
Sub 1° accuracy...
The TCM is a high-performance, low power consumption, tilt-compensated electronic compass module that provides industry-leading heading accuracy. The TCM combines PNI's patented magneto-inductive sensors and 3-axis MEMS accelerometer with PNI's proprietary factory calibration algorithms to ensure absolute accuracy.

...in real world conditions.
PNI recognizes there's a difference between performing well in the factory and perfoming well in the field. The TCM's advanced field calibration algorithms account for these differences by correcting for local magnetic distortions. And since applications may have physical constraints for doing calibration, the TCM provides four user-selectable calibration modes, as well as the ability to recalibrate the accelerometers to ensure long-term accuracy. The TCM's measurement technology inherently ensures the module is free from offset drift and provides high measurement resolution, which is critically important at high and low lattitudes where the dip angle (inclination) limits the usefulness of other compasses. So the TCM performs well in the field, not just in the factory.
FEATURES
Backward-Compatible Footprint |
Digital Interface |
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| Fits TCM2.6, TCM3 or TCM5 | Binary RS232 (TCM XB) or Binary CMOS/TTL UART (TCM MB) |
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Flexible Mounting Options |
Full Tilt Compensation |
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| 16 Orientation Options | ± 90° pitch; ± 180° roll | |
Magnetic Distortion Compensation |
High Accuracy |
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| Soft and Hard Iron Correction | 0.3° rms | |
RoHS Compliant |
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PRODUCT SPECS
Heading Specifications |
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| Heading Accuracy | <0.3° rms (≤65° of tilt after full range calibration) |
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| <2.0° rms (≤5° of tilt after 2D calibration) | ||
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<2.0° rms (≤2 times the calibration tilt angle after limited-tilt calibration) *see manual for details
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| Repeatability | 0.05° rms | |
| Resolution | 0.1° | |
Magnetometer Specifications |
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| Calibrated Field Measurement Range | ±125 µT | |
| Maximum Dip Angle (functional) |
85° | |
Tilt Specifications |
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| Accuracy | 0.2° rms | |
| Range | ±90° pitch, ±180°roll | |
| Repeatability | 0.05° rms | |
| Resolution | 0.01° | |
Mechanical Characteristics |
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| TCM XB Dimensions (L × W × H) | 3.5 × 4.3 × 1.3 cm | |
| TCM MB Dimensions (L x W x H) |
3.3 x 3.1 x 1.3 cm |
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Communication Interface |
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| TCM XB | Binary RS232 | |
| TCM MB |
Binary CMOS/TTL UART | |
I/O Characteristics |
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| Maximum Sample Rate | ≈30 samples/sec | |
Power Requirements |
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| TCM XB Current Draw (@ max sample rate) |
20 mA | |
| TCM MB Avg Current Draw (@ max sample rate) |
17 mA |
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| TCM XB Current Draw (sleep mode) |
0.3 mA |
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| TCM MB Current Draw (sleep mode) |
0.1 mA |
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| TCM XB Supply Voltage | 3.6 - 5 VDC (unregulated) | |
| TCM MB Supply Voltage | 3.3 - 5 VDC (unregulated) | |
Environmental Characteristics |
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| Operating Temperature Range | −40C to +85C | |
| Storage Temperature Range | −40C to +85C | |

