Structures and equipment exposed to mechanical vibrations as well as ambient vibration are susceptible to resonances. Predicting resonance or potential resonant amplification is a desirable thing to achieve for many reasons. Operation of equipment at or near resonance can result in catastrophic failure, reduced reliability and functionality. Knowing the natural frequency characteristics of equipment will assist in the successful design and /or modification and operation of mechanical components and structures. This presentation will explore what resonance is, conditions that lead to recommendations for performing this testing, and test methods with analysis you can perform.