Quartz Crystals Glossary
By Macrobizes
June 11, 2004
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It is the Change of nominal frequency and / or the resistance of a quartz crystal unit through the time.
Angle
It is the angle at which a resonator plate is cut from the quartz stone in relation to the original crystallographic axes. The angle of cut is critical to the performance of the crystal unit, particularly for frequency deviation over a temperature range.
AT cut
The commercial designation for a specifically oriented resonator plate, having desirable and repeatable operating characteristics. The "AT cut" is the most popular thickness-shear crystal unit manufactured today.
AT Strip
AT-cut crystal but in the shape of a rectangular strip. It has a higher ESR than a round AT-cut crystal but is smaller in size, thus allowing smaller crystal packages.
Axis Direction in quartz stone. The plural is "axes."
Base
Base is the lower portion of a crystal holder. The base incorporates a resonator mounting structure and leads or pins to connect the device to an external circuit. Please also refer to "Holder."
Bevel
Modification to one or both of the major faces of a resonator plate, in which the face is altered for a partially spherical configuration. Please also refer to "Contour."
Blank Quartz resonator plate. Also known as "wafer," "plate," or "resonator."
BT cut Commercial designation for a specifically oriented resonator plate, having well known and repeatable characteristics. "AT-cut" is more popular than "BT-cut"
C0
Also known as "Shunt Capacitance."
C1
Also known as "Motional Capacitance." Often also abbreviated as "Cm."
Capacitance
Property exhibited by two conductors separated by a dielectric where an electric charge becomes stored between the conductors. Measured in "farads" and identified with the letter "C."
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