IEC 60444-9 Ed. 1.0 en:2007
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Measurement of quartz crystal unit parameters – Part 9: Measurement of spurious resonances of piezoelectric crystal units
Describes two methods for determining the spurious (unwanted) modes of piezoelectric crystal resonators: method A (the full parameter determination) and method B (the resistance determination). Extends the capabilities and improves the reproducibility and accuracy with respect to previous methods.
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