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A change in the frequency and/or the resistance of a quartz crystal unit with the passage of time. Attributable to the relaxation of strain in the resonator and to mass transfer mechanisms within the resonator package due to contamination. Other factors include drive level, ambient temperature, wire fatigue, and frictional wear.

These factors are minimized by design considerations, including the mechanical design of the mounting structure, and by the design and control of certain manufacturing processes. Most of the aging effects of a crystal occur within the first 60 days of operation leading to slower aging characteristics through the first year. The integrity of the hermetic characteristics of the crystal package are a major factor in determining how well a crystal will age. | Site Map