![]() Measurement of quartz crystal unit parameters—Part 7: Measurement of activity dips of quartz crystal units 石英晶体元件参数的测量 第7部分:石英晶体元件活性跳变的测量 |
![]() Measuring relays and protection equipment - Part 11: Voltage dips, short interruptions, variations and ripple on auxiliary power supply port 量度继电器和保护装置 第11部分:辅助电源端口电压暂降、短时中断、电压变化和纹波 |
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