IEC？60749-12:20 17描述了一项测试，以确定指定频率范围内的变频振动对内部结构元件的影响。这是一个破坏性的测试。它通常适用于腔型封装 第二版取消并取代了2002年出版的第一版。此版本构成技术修订。？与上一版相比，此版本包括以下重大技术变更: a)与MIL-STD-883J方法2007，振动，可变频率的一致性。

IEC？60749-12:2017 describes a test to determine the effect of variable frequency vibration, within the specified frequency range, on internal structural elements. This is a destructive test. It is normally applicable to cavity-type packages
This second edition cancels and replaces the first edition published in 2002. This edition constitutes a technical revision.？This edition includes the following significant technical changes with respect to the previous edition:
a) alignment with MIL-STD-883J Method 2007, Vibration, variable frequency.