IEC 60122-1-2017 pdf free.Quartz crystal units of assessed quality—Part 1: Generic specification.
2.1 General Units, graphical symbols, letter symbols and terminology shall, wherever possible. be taken from the following standards: lEG 60027. lEG 60050(561), lEG 60617 and ISO 1000.
2.2 Terms, definitions and classification of phenomena The following paragraphs contain additional terminology applicable to quartz crystal units and describe certain phenomena in this context.
2.2.1 crystal element (crystal blank) piezoelectric material Cut to a given geometrical shape, size and orientation with respect to the crystallographic axes of the crystal.
2.2.2 electrode an electrically conductive plate or film in contact with, or in proximity to. a face of a crystal element by means of which an electric field is applied to the element.
2.2.3 crystal resonator a mounted crystal element that vibrates when an alternating electric field exists between the electrodes.
2.2.4 mounting the means by which the crystal resonator is supported (within its enclosure)
2.2.5 enclosure the enclosure protecting the crystal resonator(s) and mounting.
2.2.6 enclosure type a crystal enclosure of specific outline dimensions and material with a defined method of sealing.
2.2.7 crystal unit a crystal resonator mounted in an enclosure.
2.2.10 fundamental crystal unit a crystal resonator designed to operate at the lowest order of a given mode.
2.2.11 overtone crystal unit a crystal resonator designed to operate at a higher order than the lowest of the given mode.
2.2.12 overtone order the numbers allotted to the successive overtones of a given mode of vibration from the ascending series of integral numbers commencing with the fundamental as unity. For shear and extensional modes, this overtone is the integral multiple of the fundamental frequency to which the overtone frequency approximates.
2.2.13 crystal unit equivalent circuit the electric circuit which has the same impedance as the crystal unit in the region of the desired resonance and anti-resonance frequencies. It is represented by an inductance, capacitance and resistance in series, this series arm being shunted by the capacitance between the terminals of the unit. The parameters of the series branch of inductance, capacitance and resistance are given by L1, C1 and R1 respectively: these are termed “motional parameters” of the crystal unit. The shunt (parallel) capacitance is denoted by C0 (see figure 1).
The parameters are independent of frequency for isolated modes of motion. Generally, the mode in question is sufficiently isolated from other modes to permit this assumption. When this is not true, the equations and measuring methods outlined herein do not apply. For identification of symbols used in this standard, see table 1.IEC 60122-1 pdf download.