How to understand the lateral vibration of the fastener tran

Fastener lateral vibration testing machine is used to detect self-locking performance of fasteners in certain frequency and amplitude of lateral dynamic loads (anti loosing performance), anti loose quantitative detection is widely used in automotive fasteners, hanghang empty fasteners, wind power fasteners, fasteners and other kinds of railway fasteners.

Now, many users are often on the testing machine "vibration" doubt, that the transverse vibration is vertical with standard, only the transverse vibration level is consistent with the standard, then this argument is right?