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HJMAG804A Dual-Axis High-Precision Weak Magnetic Field Measurement Module

HJMAG804A is a dual-axis, high-precision weak magnetic field measurement module. Its circuitry comprises a constant-current source, an oscillation source, an acceleration network, a drive network, a voltage‑doubling network, an amplification network, a synchronous modulation/demodulation network, an integration network, a force‑feedback network, and a bias circuit. It employs a magnetoresistive sensor architecture to measure the ambient geomagnetic field. By incorporating a force‑feedback network that places the system in a closed loop, the HJMAG804A circuit offers superior advantages over conventional magnetoresistive sensors, including higher measurement accuracy, enhanced reliability, excellent stability, high sensitivity, and high resolution for weak magnetic fields. The module can operate at temperatures up to 180°C and is widely applicable in areas such as high‑temperature oil‑field logging, compass systems, navigation systems, and medical equipment.

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HJMAG804A Dual-Axis High-Precision Weak Magnetic Field Measurement Module

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