Fieldforce TCM | PNI Sensor Corporation

By: Pni Sensor  09-12-2011
Keywords: Compass, Digital Interface

Provides pinpoint-accurate pitch, roll and compass heading in real-world conditions, performing reliably and repeatably in the field — not just in the factory.

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.

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. 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.


Backward-Compatible Footprint
Digital Interface
  Fits TCM2.6, TCM3 or TCM5 Binary RS232 (TCM XB) or Binary CMOS/TTL UART (TCM MB)
Flexible Mounting Options
Full Tilt Compensation
  16 Orientation Options ± 90° pitch; ± 180° roll
Magnetic Distortion Compensation
High Accuracy
  Soft and Hard Iron Correction 0.3° rms
RoHS Compliant


Heading Specifications
  Heading Accuracy <0.3° rms (≤65° of tilt after full range calibration)
    <2.0° rms (≤5° of tilt after 2D calibration)

<2.0° rms (≤2 times the calibration tilt angle after limited-tilt calibration) *see manual for details

  Repeatability 0.05° rms
  Resolution 0.1°
Magnetometer Specifications
  Calibrated Field Measurement Range ±125 µT
  Maximum Dip Angle (functional)
Tilt Specifications
  Accuracy 0.2° rms
  Range ±90° pitch, ±180°roll
  Repeatability 0.05° rms
  Resolution 0.01°
Mechanical Characteristics
  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
Communication Interface
  TCM XB Binary RS232
I/O Characteristics
  Maximum Sample Rate ≈30 samples/sec
Power Requirements
  20 mA
  17 mA
  TCM XB Current Draw (sleep mode)
0.3 mA
  TCM MB Current Draw (sleep mode)
 0.1 mA
  TCM XB Supply Voltage 3.6 - 5 VDC (unregulated)
  TCM MB Supply Voltage 3.3 - 5 VDC (unregulated)
Environmental Characteristics
  Operating Temperature Range −40C to +85C
  Storage Temperature Range −40C to +85C

Keywords: Compass, Digital Interface

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