Magnetometer Sensors

Model 539

Digital High Speed 3-Axis Fluxgate Magnetometer [+/-.65G]
Model 539

The Applied Physics Systems Model 539 fluxgate magnetometer measures magnetic fields on 3-axis and converts and transmits over its serial port (at 38400 baud) to all three axes outputs at a rate of 250 samples per second. It can also measure rotation angle. It is ideally suited to situations where high speed magnetic data must be acquired and analyzed.

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The Model 539 was the first high-speed digital output 3-axis fluxgate magnetometer to be commercially available. The system can convert and transmit over its serial port (at 38400 baud) to all three axes outputs at a rate of 250 samples per second. Slower data rates can also be selected; transmission rate and baud rates are user programmable.

The Model 539 uses three separate 16-bit sigma delta converters to achieve the high throughput. The scale factor is set so that a full scale input of ± 10-4T (1G) represents 32768 counts on the system Analog-to-Digitals. The least count represents about 3nT. Noise of the system is 1 – 2 counts.

The Model 539 can be used in either a command mode or autosend mode. In the command mode, the Model 539 responds to commands to transmit data issued by an external computer. In the autosend mode, the Model 539 begins sending data as soon as power is applied to the unit.

The Model 539 can be supplied with an optional connection cable and breakout box which allows easy powering and connection to an external computer. A Windows-compatible configuration, data acquisition, and display program is supplied with the 539. This program enables the user to acquire and graphically display data as well as configure the Model 539 send rate, baud rate, output format, and other features.

In addition to the standard RS232 interface, the Model 539 is also equipped with a TTL interface for communication with a microprocessor.

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