Development of CEM’s Traceable Magnetic Measurements Laboratory

The establishment of a magnetic measurements laboratory at CEM addresses the lack of a national reference standard in Spain, which could meet the stakeholders’ needs and ensure magnetic measurements traceability. The laboratory is equipped to measure both magnetic field intensity and magnetic flux density for direct current (DC) and alternating current (AC) up to 50 kHz. This capability is made possible by the development of primary Helmholtz coils standards for generating magnetic fields. Traceability is ensured throughout the use of a Nuclear Magnetic Resonance (NMR) sensor, which measures the DC magnetic field by providing a frequency signal linked to the frequency standard. For low and medium magnetic flux density measurements, the main source of uncertainty is due to the environmental magnetic fields, making the use of a cancellation system essential. To ensure measurement accuracy, an active compensation system is employed.