Best practice guide for the generation and measurement of DC magnetic fields in the magnetic field range of 1 nT to 1 mT

The object of this guide is to define the general principles and the technical details of the generation and measurement of DC magnetic fields in the range 1 nT to 1 mT. Calibration at temperatures in the range - 55 oC to 125 oC will be described along with calibration methods for 3 axis magnetometers. After introducing the facilities that are required to establish the necessary ambient magnetic field conditions, methods for generating magnetic fields with the required range and uniformity will be explained. This will include aspects such as the size and geometry of the coil system necessary to establish a suitably uniform field through the volume of the sensor. How the coil systems and customer magnetometers are calibrated and the uncertainties of these calibrations established will be covered along with typical additional uncertainties that need to be considered when the magnetometer is used in an industrial location. Examples of European facilities and measurement case studies will be used to demonstrate these principles.