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ECA 512 Document Information:
Title
Standard Methods for Measurement of the Equivalent Electrical Parameters of Quartz Crystal Units, 1 kHz to 1 GHz
Electronic Components, Assemblies & Materials Association
Publication Date:
Oct 1, 1983
Scope:
Methods are described which permit determination of the values of the
equivalent electrical parameters of piezoelectric quartz crystal units,
utilizing automated measuring equipment. The methods described make use
of standard coaxial terminations, standard calibrated mis-matched
terminations, coaxial air-lines, and short-circuit terminations for both
calibration of the instrument/test fixture error terms, and for
verification of instrument performance. These coaxial standards,
designed for 50 ohm systems, are readily available, and can be
standardized in terms of national standards of impedance over very wide
frequency ranges.
The measurement methods described are intended to provide standard
reference values of the electrical equivalent parameters. Manufacturers
and users may employ any other methods of measurement desired,
(Footnotes 10, 12) however, when other methods are used, the values
obtained shall be correlated to those obtained by the reference methods.
This standard is concerned only with the equivalent electrical network
which approximates the admittance/impedance characteristic of a crystal
unit over a relatively narrow range of frequencies near an isolated mode
of vibration, at a particular excitation level. Non-linear amplitude
behavior, or the presence of interfering modes of vibration, not only
interfere with the actual measurement, but also render the accepted
equivalent network representation invalid.
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