In addition, a set of high frequency Helmholtz coils have been produced for the calibration of magnetic field meters up to a frequency of 120 kHz. This system is used to calibrate portable magnetic field meters that are used for compliance testing. The magnetic field range covered by the facility has been selected to meet that of the majority of meters available on the market. Limited measurements for non‐sinusoidal waveforms are also available. Also available are the facilities to calibrate DC magnetic field instruments up to 3 T. Other capabilities include both static (DC) and time-varying (AC) magnetic field surveys of customers’ sites where the magnetic signature of the local environment is required to be known, and once known mitigation (e.g. screening) can be employed if required.
