KS C IEC 60642-2018(2023) Piezoelectric ceramic resonators and resonator units for frequency control and selection — Chapter I: Standard values and conditions — Chapter II: Measuring and test conditions
2023KS C IEC 60642-2023 Piezoelectric Ceramic Resonators and Resonator Units for Frequency Control and Selection Chapter 1 Standard Values and Conditions Chapter 2 Measurement and Test Conditions
0000 KS C IEC 60642-3-2002(2022)
2018KS C IEC 60642:2018 Piezoelectric ceramic resonators and resonator units for frequency control and selection — Chapter I: Standard values and conditions — Chapter II: Measuring and test conditions