Quartz Crystals Glossary
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PF
Abbreviation for "picoFarad," used to describe a fractional part 10-12, (one trillionth) of one Farad.
Pico
A prefix used to describe a sub-multiple of a number. One pico is one trillionth, 10-12, of a unit.
Plate
A quartz blank or resonator.
Polish
Polish is a term used to describe the process used in the manufacture of some types of quartz crystals. Which results in a very fine surface finish. Polish is also used to denote the material used in this process.
PPM
Abbreviation for "Parts Per Million," a method of calculation used to specify the acceptable frequency deviation of a crystal or oscillator.
Pullability
Change in frequency of a crystal unit; either from the natural resonant frequency (Fr) to a load resonant frequency (FL); or from one load resonant frequency to another. Frequency can be pulled in a parallel resonant circuit by changing the value of load capacitance.
Quartz
It is the crystalline form of Silicon Dioxide (SiO2). Material from which a blank is made.
Quartz Crystal Unit
A finished quartz crystal; consists of a resonator plate with electrodes, holder with suitable mounting structures, and a permanently sealed cover. Usually referred simply as a "crystal."
Reactance
Opposition to an alternating current presented by inductance, capacitance, or a combination of the two. Measured in "ohms" and denoted with the letter "X."
Resistance
The opposition to current flow in a circuit represented by the letter "R" and is measured in "ohms."
Resistance Weld
Procedure involving pressure sealing with electricity and back filling with nitrogen to force out oxygen and moisture. This process provides superior aging characteristics.
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