Measurement of quartz crystal unit parameters - Part 9: Measurement of spurious resonances of piezoelectric crystal units
石英晶体单元参数的测量.第9部分:压电晶体单元寄生谐振的测量
IEC 60444-9:2007 describes two methods for determining the spurious (unwanted) modes of piezoelectric crystal resonators. It extends the capabilities and improves the reproducibility and accuracy compared to previous methods.