Accession Number : ADP002489

Title :   A Measurement Technique for Determination of Frequency vs. Acceleration Characteristics of Quartz Crystal Units,


Personal Author(s) : Healey,D. J. , III ; Hahn,H. ; Powell,S.

Report Date : 1983

Pagination or Media Count : 6

Abstract : A computer-controlled g-sensitivity measuring apparatus has been assembled and used to screen 100 MHz AT-cut crystal units for any manufacturing defect. This apparatus obtains the g-sensitivity vs. acceleration characteristic of a crystal unit alone in less than 100 seconds in a given direction. The basic equations governing computation of g-sensitivity from the measured data can be used to determine a new set of component requirements for the apparatus when measuring different crystal types to a specified g-sensitivity level. It has already been shown that measurement of g-sensitivity levels less than 10 to the minus 11th power is possible for 100 MHz quartz crystal units. The described g-sensitivity measurement technique can be used to study mechanical resonance properties of crystal mounting and packaging schemes, simply screen defective crystal units, or investigate interfering modes of low frequency mechanical resonances of the crystal plate and supporting systems after a simple modification of the measurement software.

Descriptors :   *Quartz, *Acceleration, *Frequency response, Crystals, Measuring instruments, Resonant frequency, Spectrum analysis, Computer aided diagnosis

Distribution Statement : APPROVED FOR PUBLIC RELEASE