Abstract
Abstmcf-The objective of the study presented here is the determination of aging characteristics of the local crystal which has been in continuous operation for fifteen years. To do this, the data accumulated since 1968, by phase comparison of the local crystal with the 16 kHz primary standard frequency emitted from Rugby, England, has been analyzed from the point of view of aging in the local crystal. The aging rate, which was parts in lo9 per day at the very early phase of operation of the local crystal, came down to parts in 10l2 per day at present. In this study an AT-cut rectangular quartz plate vibrating at 5 MHz is used. Since there is not a unique theory of aging in literature for crystal resonators, an attempt to explain the time dependence of the aging rate for the AT-cut crystal chips is made by making use of observed aging characteristics. It is believed that the study may help in the developments of nonaging quartz crystal units.
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