Quartz Crystals Glossary
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Resistor
Component used to introduce resistance into a circuit.
Resonant Frequency
Natural frequency at which a device vibrates. Abbreviated as "Frq" or "frq."
Resonance
Creation of vibrations in a system by applying periodic force; which is present when the frequency of the applied force is equal to the natural frequency of the system.
Resonator
Part that is capable of being set into resonance by the application of a periodic force.
Second
Basic unit of measurement of time, for our purposes, one "second" is 1/60th of a minute.
Series Resonance
Condition when a crystal unit is operated without the presence of load capacitance. "Series Resonance" is usually described as "series."
Shunt Capacitance
Parameter associated with a quartz crystal unit, used to denote capacitance resulting from the presence of the electrodes plus stray capacitance associated with the holder.
SMD
Abbreviation for "Surface Mount Device."
Spur
Substitution for the term "Spurious Frequency Response." Spur is used to describe a frequency occurring at some point higher than the desired mode but lower than the next overtone.
Tape and Reel
A packaging style which, can accommodate automated pick & place equipment.
Test Set
Measures the frequency and resistance characteristic of a quartz crystal unit. Also referred as "crystal impedance meter," abbreviated as "C.I.M."
Trim Sensitivity
Measurement of the incremental fractional frequency change for an incremental change in the value of load capacitance. Trim sensitivity (S) is expressed in terms of PPM/pF and is calculated as follows:
Where (Ct) is the sum of the shunt capacitance (CO) and the load capacitance (CL).
Turnover Temperature
Temperature at which, the nominal frequency is at the up-most part of the parabolic curve.
Twinning
A condition within quartz stone where the optic and/or the electric axis suddenly reverse its natural order of polarity.
Volt
Basic practical unit of difference of (electrical) potenti
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