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Activity -
A term associated with the resistance of a crystal unit. A crystal unit with low resistance is said to have good activity while a crystal unit with high resistance is said to have bad activity.
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Activity Dip -
A term used to describe a sudden increase followed by a return to the previous level of the activity of a crystal unit.
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Aging -
A change in the frequency and/or the resistance of a quartz crystal unit with the passage of time.
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Angle -
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 in the area of frequency deviation over a temperature range.
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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. See Chart
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AT Strip -
An AT-cut crystal 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.
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Axis -
A direction in a quartz stone. The plural of "axis" is "axes."
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Base -
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. See also "Holder."
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Bevel -
A modification to one or both of the major faces of a resonator plate in which the face is altered to have a partially spherical configuration. Also see "Contour."
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Blank -
A quartz resonator plate. Also known as a "wafer," a "plate," or a "resonator."
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BT cut -
The commercial designation for a specifically oriented resonator plate, having well known and repeatable characteristics. The "BT cut" is less popular than the "AT."
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C0 -
The abbreviation for "Shunt Capacitance."
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C1 -
The abbreviation for "Motional Capacitance." Motional capacitance is also often abbreviated as "Cm."
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Capacitance -
The property exhibited by two conductors separated by a dielectric whereby an electric charge becomes stored between the conductors. Capacitance is measured in "farads" and is identified by the letter "C."
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Capacitor -
A passive electronic circuit component consisting, in its simplest form, of two metal electrodes separated by a dielectric.
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C.I -
The abbreviation for "crystal impedance," sometimes used in place of the word "resistance."
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C.I.M -
The abbreviation for "crystal impedance meter."
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