标准摘要
[中文适用范围]： 描述了测量和评估石英晶体单元在一定温度范围内的活性和频率骤降的程序。 [外文原描述]： IEC 60444-7:2004 applies to activity and frequency dips for quartz crystal units over a temperature range.
英文名称Measurement of quartz crystal unit parameters - Part 7: Measurement of activity and frequency dips of quartz crystal units