DS DS/EN 60689
DS DSEN 60689 2009-APR-22 Measurement and test methods for tunng fork quartz crystal unts n the range from 10 kHz to 200 kHz and standard values
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This International Standard applies to measurements and test methods for tuning fork quartz crystal units in the range from 10 kHz to 200 kHz and standard values for frequency control and selection.