Magnetometer WFG-D-140

The Model WFG-D-140 Sensor is a tri-axial vector magnetometer system with a high-speed digital interface that can transmit XYZ magnetic field values at up to 140 times per second. The WFG-D-140 System contains a microprocessor and a three channel 16-bit analog-to-digital converter. The system also contains a temperature sensor. The system microprocessor and A-to-D subsystem: convert the sensor analog outputs to digital form calibrate the sensor scale, offset and alignment implement serial communications between the system and an external computer An ASCII character command language facilitates communication with the WFG-D-140 . An autosend data mode is included in the WFG-D-140 software. When this mode is active, data is repeatedly sent out the serial port after power is applied to the system. The WFG-D-140 magnetometers are calibrated by mounting the system in a precision holding fi xture, placing this in a 3-axis Helmholtz coil, and systematically applying known magnetic fi elds to the sensor. System calibration can be performed at a base temperature (usu-ally 25°C) or as an option over a temperature range (for example 0-75°C). When the system is calibrated over a temperature range, data is read from the system at temperature intervals between the minimum and maximum temperature specification. For instance, for calibration over the interval of 0-75°C, data is usually read at 25°C temperature intervals at 0°C, 25°C, 50°C, and 75°C. The data taken at each temperature includes scale, offset, and sensor alignment data.