ELECTRODE CAPACITANCE - Ce
A quartz plate with electrodes placed on the two sides is a capacitor with quartz as a dielectric.
HOLDER CAPACITANCE - Ch
The metal holder and leads act as a capacitor with air as the dielectric.
SHUNT CAPACITANCE - Co
Shunt capacitance, Co, is the parallel equivalent or sum of the capacitance of the electrodes, Ce, and the capacitance of the metal holder, Ch.
Co = Ce + Ch
Shunt capacitance is typically specified as a maximum value in picofarads, pF. Co has an affect on the motional capacitance which determines the "pullability" of a crystal. Design and manufacturing practices generally work to minimize Co.
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