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Table 1 Main specifications of the magnetometer systems for the prototype model and the standard model, which are distinguished by the type of the control board

From: A new miniaturized magnetometer system for long-term distributed observation on the seafloor

Item Prototype model Standard model
Acceptable power source voltage 2.7–15 V 2.4–25 V
Time synchronization accuracy 0.1 ms 0.1 ms
Magnetic field (3 axes)
 Dynamic range ± 60,000 nT ± 60,000 nT
 Accuracy (noise floor σ) < 0.12 nT < 0.06 nT
 Bit depth 24 bits 24 bits
 Sampling frequency < 5 Hza < 5 Hza
Tilt (3 axes)
 Accuracy 0.1° 0.1°
 Bit depth 16 bits 16 bits
 Sampling frequency < 1 Hz < 1 Hz
Temperature
 Dynamic range − 40 to + 125 °C − 40 to + 125 °C
 Accuracy < 0.5 °C < 0.5 °C
 Bit depth 12 bits 12 bits
 Sampling frequency < 1 Hz < 1 Hz
Battery voltage
 Accuracy 5 mV 5 mV
 Bit depth 16 bits 16 bits
 Sampling frequency < 1 Hz < 1 Hz
Power consumption @3.8 V input Typ. 36 mW Typ. 33 mW
Power consumption @7.0 V input Typ. 36 mW Typ. 36 mW
System size (without batteries) 33 × 35 × 293 mm Φ35 × 180 mm
Operating lifetime > 2 years > 2 years
  1. aInternal electrical activities (measuring tilt, temperature, and voltage, and storing data) periodically corrupt magnetic field data of 1.7% at maximum (see the main text for details)