IEC 61178-1:1993 Quartz crystal units; a specification in the IEC quality assessment system for electronic components (IECQ); part 1: generic specification has been changed from IEC 60122-1:1976 Quartz crystal units for frequency control and selection. Part 1 : Standard values and test conditions.
IEC 61178-1:1993 Quartz crystal units; a specification in the IEC quality assessment system for electronic components (IECQ); part 1: generic specification was changed to IEC 60122-1:2002 Quartz crystal units of assessed quality - Part 1: Generic specification.
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