Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DC to the upper end of the audio frequency range and beyond. The generated fields are in a strong linear relation to the coil current. The field- strength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current.

Therefore Helmholtz-Coils are ideally suited for the calibration of magnetic field probes or sensors. Typical applications are magnetic immunity testing according to automotive standards or MIL-461F.

When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic field strength.