Establishing reliability in vibration measurement and its international equivalency: —Development of national metrology standards for vibration, acceleration, shock measurement and progress on international comparisons—

On the other hand, as it can be projected from Fig. 1, while the mass can stay at a fixed point as long as the vibration amplitude is small enough, the mass will not be able to stay at the fixed point due to the restoring force of the spring when the vibration surpasses a certain level. Such a property is determined by the stiffness of the spring, the natural vibration when considered as a mass-spring model, and the viscous element (damping) that absorbs vibration though this is abbreviated in Fig. 1. The vibrometer manufacturers optimize the above parameters for specific uses such as measurement of earthquakes, vibration of structures such