EIA 512-1985

$30.55

Standard Methods for Measurement of the Equivalent Electrical Parameters of Quartz Crystal Units, 1 kHz to 1 GHz

Published By	Publication Date	Number of Pages
ECIA	1985	40

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Category: ECIA

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Description

Methods are described which permit determination of fhe 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 mismatched 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
de sired,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, also render the accepted equivalent network
representation invalid.

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