Magnetometer Sensors

Model 535

Analog Wide Range 3-Axis Fluxgate Magnetometer
Model 535

The Applied Physics Systems Model 535 is a small, low cost magnetometer designed to measure small magnetic fields (.02 milligauss to 5 Gauss). It is designed for fine measurement of magnetic fields and is suited to applications like road sensors and setting barricades.

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The Model 535 is powered from bipolar ±15 VDC supplies. Two internal regulators are present in the 535, which produce ±12 VDC for internal use.

Analog Wide Range 3-Axis Fluxgate Magnetometer

Output from the sensor is 3 analog voltages, proportional to the magnetic field in three orthogonal directions. Full scale output is ±10 volts, which represents a magnetic field of ±5 Gauss.

The Model 535 system employs an optional active failure recognition system to detect when any of the three fluxgate sensors stops performing properly. The failure system functions by applying a low level magnetic signal (500 Hz) to each fluxgate sensor and then detecting the presence of the signal in each of the fluxgate output channels. The failure output is present on pin A of the Model 535 connector. This output is at a TTL high level when the fluxgate sensors are operating properly. This output goes to TTL low when any of the 3 fluxgate sensors fail. This feature is useful for applications such as magnetic guidance systems where correct operation of the sensors is critical. 

For sensor alignment, the X axis is aligned parallel to the package long dimension. The Z axis is aligned with the two through holes in the aluminum connector mounts. The system Y axis is orthogonal to the X and Z directions. The system coordinate system is right handed. The output polarity sense of the axes is such that a field increase in the direction of the arrows produces an increase in the voltage output for that axis. In general, the magnetic axis of the 535 systems will be orthogonal and aligned to within ±0.2° of the right- handed coordinate system specified by the outer package alignment surface and alignment holes.

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