BS 9612 N016:1979
Отменен
Detail specification for resistance welded seal quartz crystal units for oscillator applications. DN, DZ, DQ and DP enclosures, 0.8 to 20 MHz and 3.0 to 30 MHz frequency ranges. Fundamental thickness-shear mode, AT-cut, for operation over wide temperature ranges (non-temperature controlled). Full assessment level
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