Introduction to Quartz Frequency Standards - Magnetic-Field Effects

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Quartz is diamagnetic; however, magnetic fields can affect magnetic materials in the crystal unit's mounting structure, electrodes, and enclosure. Time-varying electric fields will induce eddy currents in the metallic parts. Magnetic fields can also affect components such as inductors in the oscillator circuitry. When a crystal oscillator is designed to minimize the effects of magnetic fields, the sensitivity can be much less than 10^-10 per oersted. Magnetic-field sensitivities on the order of 10^-12 per oersted have been measured in crystal units designed specifically for low magnetic-field sensitivity [32].

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