High-Precision Current Sensor

A fluxgate current sensor is a highly accurate device that measures both DC and AC currents by exploiting the magnetic saturation properties of a ferromagnetic core. Its principle relies on the non-linear B-H curve of the core. An excitation coil is driven by a high-frequency AC signal, repeatedly saturating the core in both positive and negative directions. When an external magnetic field from the measured current is present, it creates an asymmetry in the saturation timing. This imbalance induces a specific harmonic component in a secondary sensing coil, which is then precisely detected and processed to calculate the exact value of the external current.

Product Features

    1. Extremely High Accuracy and Resolution: It offers exceptional precision, with very low offset and gain drift, capable of measuring minute currents (in the mA range) even in the presence of large DC components.

    2. Excellent DC Stability and Low Noise: Unlike Hall-effect sensors, the fluxgate principle provides superior stability for DC and low-frequency current measurements with minimal intrinsic noise.

    3. Wide Bandwidth: While optimized for precision, modern fluxgate sensors also maintain good bandwidth, suitable for measuring dynamic current waveforms accurately.

Common Applications

         These sensors are used in demanding applications where the highest accuracy is paramount:

    1. Precision Power Analyzers and high-end laboratory test equipment.

    2. Battery Test Equipment and Solar Array Monitoring, where exact current measurement is critical for efficiency calculations.

    3. Medical Imaging Systems (e.g., MRI) and scientific research instrumentation.