is the final plating step for the resonator. In many aspects, the process is
similar to the deposition of the electrode except that far less metal is
used. The purpose of calibration is to finely adjust the frequency of the
resonator to a specified operating point.Generally, the frequencies of quartz
resonators are calibrated to less than ±1ppm of their target frequencies.
Interestingly, the whole process
of plating the electrode and calibrating are reverse as to their effects on
the quartz resonator with respect to the grinding and lapping operations.
Consequently, the processes of quartz removal and metal deposition are used
in conjunction to iteratively create the desired operating frequency.