Plasma is a naturally dynamic state of matter that can support a host of instabilities that play an important role in how EP devices function; however, when​ discussing the stability of EP systems we typically are interested in large-scale, large-amplitude transient phenomena that can affect performance and lifetime. In several cases, such phenomena are poorly understood from a fundamental perspective and their properties and onset are difficult to predict. To this end, PEPL has developed a suite of time-resolved diagnostics to observe and characterize these plasma waves.