There are two primary testing schemes for vibration testing: sinusoidal and random. ATS can perform either method based on the device’s intended application. While sinusoidal testing subjects a sample to one frequency of vibration at a time (which they may use to determine the resonant frequency or induce fatigue to observe prevalent failure modes), random vibration testing exposes samples to several different vibrational frequencies at once. Doing so approximates the “background noise” endemic to nearly every service environment, as well as the forces it must survive in transit. These vibrations may be caused by any number of sources, including the hum of a truck driving over the road as it transports the product, turbulent flow inside a pipe, rocket take-off, and hundreds of other events that product engineers must anticipate but can never exhaustively predict.